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Verifit User Guide

1. M 27 Changing the NOAH service Port sccis ioiaren ete RISE Rete EEE es eH E ent e T De RR ED Epub E PER ue e RE Oi i 27 Westing the NOAH Service P ttering r ARE O E EE EEE yoeadeudcesaraacgueesteegasevaesaesousabeosti 28 6 Smelecomputer COMME CII OM lt 2 coerceri oc eret te tre ee PERPE n tone eret ete ter enis r dr E a a a a eo Ee 29 Automatic connection recommendecd 5 oe ar rera tret e eher resi teo rei EAA NERE ets ERR HIN Or 29 Stc Connec Ho seni EET 29 7 Printing and Stonne ResuliScss inserare erre need tete etae E E edo E ASEE EAE E RETE EOE AS 31 Internal printer paper ladi g cesariana S E Ee o EE EARE E Ev etd o cout pepe 31 Barcodes tabular data headers and comments on printouts eese eene enne nennen nennt nnns ennn 32 Local printer Setups ao nene rider tiere E er e Re ERE ene uU ER ETA PE EE Rh 33 Printing to USB memotby Ret ee E TNI UII P ERE ERE RM UE ee USE UE Qe GE ERR RUNE Re to 33 NCDVUDPIECDPIBIEE Se UE ect ag a suck cetata duces tne N utes emiten dera etu LL Ed ester 34 Printing foa network lee aene THU E EEUU EETITN SH RE Perte NOMBRE CHEER aa ea Ei a a A EEEa EEST 34 storing and restoring data Setup iecit rire er ette ntn epe MEUS o EOS EE RUPES Ee SEES ERE a ER HERE ERES SEE PARERE PERSE R 35 Stonne and restoring dalg eee ere a DERE Ee a aa Deubanas IER ege en E e epe e EXE HER VERRE RR Ve ia 36 Data storage using INQUABL G cei err
2. audioscain gt Instrument CROS ivi Mode On ear _ Presentation Single view Format Graph vi Scale dB SPL LI Audiometry Age Adult Transducer Headphone UCL Average RECD Average BCT NIA Binaural No REDD Average Test Stimulus Level Sil A 1 Pink noise SS 100 2 Pink noise 55 fioo Unaided avg 65 Hide Show Curve T Loop fitting and verification in Speechmap This test allows the T Loop response of the hearing instrument to be measured so that it can be compared against a 65 dB SPL acoustic response 1 Set the instrument to T Telecoil input 2 Position the hearing instrument on the T inscription on the test chamber floor vertically oriented as worn by a seated individual as shown below 3 Press Test and select any stimulus type except MPO Speech live or Pink Noise 109 Verifit User s Guide Version 3 12 May 2015 4 Change the level to T Loop 65 This will result in a T Loop signal equivalent to a 65 dB SPL acoustic stimulus 5 Press Continue to measure and store the long term averaged result The result can be directly compared against a 65 dB acoustic response as shown below Speechmap audioscan 140 Instrument BIE F 130 l n Testbox Presentation Single view 120 Format Graph F 110 l Scale dB SPL 100 Audiometry 90
3. Cancel a Continue LJ Help a 3 Select Continue 4 You will be prompted to restart the equipment Select Continue to restart or Cancel to enter a different port number Restart required Changing the NOAH service port requires restarting the equipment Cancel Continue LJ Help e Testing the NOAH service port The Verifit provides the NOAH service using the HTTP protocol Communication between the Windows PC and the Verifit can be tested using an ordinary web browser 1 On the Windows PC enter the Verifit network address and port number into a web browser following this example http 172 30 86 8080 noah 2 If the communication is successful the web browser will display NOAH data formatted in XML lt noah gt Example XML lt noah gt 28 Verifit User s Guide Version 3 12 May 2015 6 Single computer connection Most office computers today are already connected to a network through either a wired or wireless wifi interface In these cases the Verifit must be added to the same network as the computer See Networking for details In cases where no network exists the Verifit can be networked directly to a single computer There are two methods depending on the network hardware available The following two sections describe the alternatives The computer must be running Windows 7 or higher and have an available functioning network port Please note only
4. Broadcast 172 i30 wil 1 2 wi Netmask 255 w 255 w 255 vl 0 F Cancel e Continue a Help a 8 Select Continue 9 Click on the Test button to check that a connection has been established 30 Verifit User s Guide Version 3 12 May 2015 7 Printing and Storing Results Pressing Print will cause the current screen image to be printed on the internal printer on an external local printer on a network printer on a Windows shared printer on a networked PC or saved to file on a USB memory stick or a Windows shared file on a networked PC Date time barcoded audiometric data and fixed or variable headers and comments via a connected keyboard may be added to printouts but not when saving to a file Tabular data may be appended to printouts of graphic data Session data may also be saved as an xml file to a USB memory stick or in a Windows shared folder on a networked PC for further analysis or to be restored to a Verifit or another Audioscan analyzer NOTE If a header comment or client ID field or file name identifies the printed or saved data as belonging to an individual it becomes Individually Identifiable Health Information and must be protected under the HIPAA Security Rule See Appendix 1 Manufacturer Disclosure Statement for Medical Device Security Internal printer paper loading On screen instructions on paper replacement are provided when the paper lever has been raised To load a new roll of
5. Speechmap DSL 5 0a adult audioscan 140 Instrument BTE vi 130 Mode Testbox Presentation Single view Format Graph v 110 x Scale dB SPL of 100 i i i Step 1 Audiometry 90 Age Adult 80 Transducer Insert Foam UCL Average 70 RECD Average 60 BCT NIA Binaural No 50 40 30 Test Stimulus Level SII Step 2 1 Speech4STS Soft 50 31 20 l l po AI 16 Vu c XN ee PM an B ai Unaided avg 65 J25 Curve Hide Show Db zn Eu ul 250 500 1000 2000 4000 8000 103 Verifit User s Guide Version 3 12 May 2015 Fitting to targets for loud sounds 4 Select Test 2 amp set stimulus to MPO In test box mode 90 dB tone bursts are presented at 1 3 octave frequencies in a repeating sequence In on ear mode a single sequence of 85 dB tone bursts is presented when you press Continue 5 In test box mode adjust high level gain and or output limiting e g MPO PC so the curve matches the REAR90 targets DSL or approaches but doesn t exceed the RESR targets NAL NL1 NAL NL2 at all frequencies Press Continue to record the MPO curve In on ear mode advise the client to point to the screen if a sound becomes too loud during the test see Max TM SPL setup Press Continue to run and record a single sweep Adjust the gain and output for loud sounds as for test box measures factorin
6. Interval Weekly Expires Mon Dec 15 1 00am Measure real ear Real ear HA 1 RECD e AYO HAA RECD oo EL AE Lr n c c nz reci 250 500 1000 2000 4000 8000 ANSI S3 46 2013 RECD The ANSI S3 46 2013 Real Ear standard advises RECD measurement protocols that make the RECD a property of the ear itself and independent of transducer or acoustic coupling To achieve this accuracy certain conditions must be met in both RECD measurement and Test box Speechmap coupling As earmold tubing effects are dependent on coupled sound source the ANSI protocol accounts for these by making the earmold part of the Speechmap testing in the test box BTE hearing aids are coupled to the HA 1 coupler through the client s personal earmold For similar reasons the on ear RECD measurement is performed with a foam eartip rather than the earmold This minimizes the error that arises from unknown lengths of tubing added to the RECD transducer These tubing effects are now more correctly being accounted for during the simulation on the coupler The ANSI RECD protocol can pose certain challenges in clinical implementation so alternate methods of RECD measurement are possible Test box Speechmap allows the selection of coupling for BTE instruments HA 1 or HA 2 so the more traditional HA 2 BTE coupler can be utilized RECD protocols A measured RECD is used both for simulation in the coupler Test box Speechmap and for correcting H
7. eechmap DSL 5 0a child audioscan J Instrument BTE Aided LTASS for Speech5000 amp Mode Testbox x x x Presentation Single view Oo Format Graph iv i T x Scale dB SPL LI iux TM Audiometry With frequency lowering Em Transducer Insert Foam UCL Average RECD Average BCT N A Binaural No Without frequency lowering Test Stimulus Level SII A Speechsooo Avg 65 NIA E 2 Speechsooo Avg 65 NIA TEE E ME sid iE 4 Unaided avg 65 148 le mm Saal ae ee Se as ac a et a es i 250 500 1000 2000 4000 8000 Curve fitting and verification FM Offset or FM Transparency method in Speechmap after Platz 2004 Hide Show It is assumed that the hearing aid has been set up for optimal audibility and maximum output See other sections of Speechmap Fitting Procedures 1 Before attaching the FM receiver couple the hearing aid to the 2cc coupler in the test box and select Speechmap from the Test box measures menu Select the appropriate hearing Instrument type typically BTE 107 Verifit User s Guide Version 3 12 May 2015 Highlight and Pick Test 1 and choose Speech std 1 2 or the ISTS at a Level of 65 dB Press Continue to run and record the speech passage Attach the FM receiver to the hearing aid and set the FM receiver to the default setting The FM transmitter should be ON and set to MUTE Repeat step 2 but use Test 2 instead of Test 1 If the results
8. Age Adult 80 Transducer Headphone UCL Average 70 RECD Average 60 _ BCT NA Binaural No d REDD Average 40 30 Test Stimulus Level SII A l l l l l m Speech std 1 Avg 65 92 9 pu 2 Speech std 1 TL 65 93 10 Id ce JN qam OE 9274 0 as E Unaided avg 65 100 VO Curve Hide Show 250 500 1000 2000 4000 8000 Note The TL 65 stimulus level produces a magnetic field strength of 56 2 mA m which is equivalent to the IEC 110 Verifit User s Guide Version 3 12 May 2015 specification 70dB SPL 100 mA m and the ANSI specification 60 dB SPL 31 6 mA m 111 Verifit User s Guide Version 3 12 May 2015 20 Speechmap Technical Details Speechmap provides a variety of stimuli for the testing of non linear hearing aids with a range of digital processing features Additional information regarding the stimuli and their analysis is provided in Appendix 2 of the printable User s Guide Speechmap stimuli The Speechmap fitting environment provides a number of well controlled distinctly different stimuli for both On ear and Test box measurement modes Four different digitized speech passages 2 male 1 female and 1 child are provided as well as the International Speech Test Signal ISTS and the single talker International Collegium of Rehabilitative Audiology ICRA distorted speech signal In addition one of the speech passages has been filtered to provide 3 variations for eva
9. 0 30 Lam Sac ates a meet Wiest GIRL SS een ieee er Neo freee fen to 250 500 1000 2000 4000 8000 Viewport setup Oct 9 2010 5 07pm audioscain amp Directional 250 500 Noise reduction 1000 2000 4000 8000 amp 250 500 1000 2000 4000 8000 The stimulus type and level used in each of the four tests that make up the Viewport suite are preset but with the Viewport Setup screen they can be customized to individual practice preferences Fitting targets NAL NL1 NAL NL2 DSL or NONE and transducer type HEADPHONE or INSERT FOAM for the AUDIBILITY test can be selected in this Setup mode and will be remembered until they are changed or reset to default values To change Viewport settings 1 Press Setup then highlight and lt PICK gt Viewport 2 Highlight and lt PICK gt the Stimulus Level or SNR list buttons and then highlight and lt PICK gt one of the items in the list box 3 Highlight and lt PICK gt Reset to defaults to restore factory settings 4 Press Continue to save the changes and exit 115 Verifit User s Guide Version 3 12 May 2015 Accessing Viewport tests 1 2 Press lt Tests gt then highlight and lt PICK gt Viewport Highlight and lt PICK gt Test box to prefit a hearing instrument and pre verify the functions of key digital features prior to fitting highlight and lt PICK gt On ear to perform on ear fitting demonstrate
10. 9 The device can connect to any networked computer to store and retrieve data provided the user name and password is entered Once the username and password is entered it is maintained by the device 10 Wireless 802 11 network connection standard on Verifit optional on Axiom n a for RMSOOSL Adapted from Information Security for Biomedical Technology A HIPAA Compliance Guide ACCE ECRI 2004 ACCE the American College of Clinical Engineering ECRI formerly the Emergency Care Research Institute MDS v 1 0 2004 11 01 Side 2 2004 HIMSS All rights reserved 142 Verifit User s Guide Version 3 12 May 2015 27 Appendix 2 AudioNote 2 1 VERIFIT and RM500SL Test Signals and Analysis For additional details of the signals and their analysis see the appended AudioNote 143 audionote 2 Verifit amp RM500SL Test Signals amp Analysis Bill Cole BASc PEng 1 Introduction The Verifit and RM500SL are full duplex dual chan nel audio measurement systems designed for the testing and fitting of all types of hearing instruments and many assistive listening devices They provide an acoustic test chamber for the testing of devices coupled to standard 2 cm couplers as well as sound field speaker s for on ear measurement of hearing aid performance The Verifit test chamber contains two loudspeakers for the functional testing of direc tional hearing instruments Test signals are deliv ered to the device under
11. Highlight and lt PICK gt Test 1 to present speech at 50 dB SPL default The middle of the three active curves now visible LTASS should hover above the red or blue threshold curve for as broad a range of frequencies as is possible or it should hover at the target levels if targets are displayed If it does not adjust gain without changing compression until it does Press lt Continue gt and wait for the test to complete Repeat as needed to get the middle curve just above threshold or around the displayed fitting target Highlight and lt PICK gt Test 2 to present speech at 65 dB SPL default The lower curve should now hover at or just above the threshold curve If targets are displayed then the middle curve LTASS should hover at the target levels If either of these results are not evident adjust high level gain or compression ratio until the desired result is obtained Press lt Continue gt and wait for the test to complete Repeat as needed NOTE Running a new test hides the envelope for previous speech test s To re display the hidden envelope highlight and lt PICK gt Hide Show and select the corresponding envelope right column button Highlight and lt PICK gt Test 3 to present tones at 90 Test box or 85 On ear dB SPL In the On ear mode no tones are presented until you press lt Continue gt The measured curve should be near but below the markers at all frequencies If it is not adjust the MPO control s of th
12. In the Test box mode in Speechmap previously called S REM measurements made in the 2 cc coupler in the test chamber are converted to estimated real ear SPL In this mode the effects of hearing aid microphone location need to be included in the test signals so spectra are further altered to include the microphone location effects shown in Figure 6 Long Term Average 1 3 Octave Spectra LTASS for Speech Signals Average Effort re overall SPL for entire passage Hanning window 128 ms average 0 00 5 00 25 00 BAND SPL dB re overall SPL LTASS re overall SPL FEMALE LTASS re overall SPL CHILD LTASS re overall SPL ICRA amp LTASS re overall SPL ISTS LTASS re overall SPL STANDARD 200 250 315 400 500 630 800 1000 1250 1600 2000 2500 3150 4000 5000 6300 8000 BAND CENTER FREQUENCY Hz Figure 3 LTASS for Speechmap speech signals at average vocal effort 100 LTASS Speech std 1 90 80 70 60 LTASS Speech40007 40 LTASS Speech6000 uui I LTASS Speech6300 20 i E UEM 10 aa n Tm oe 4000 8000 Figure 4 LTASS for Speech std 1 Speech4000 Speech5000 Speech6300 for the FM boom location effects of Figure 6 Note that curves are 1 3 octave band levels at 1 12 octave intervals which causes the 1 3 octave bands at 4000 5000 and 6300 Hz to appear broader than 1 3 octave For clarity the Speech3150 curve has been omitted
13. As a result of reanalysis of published data the previous distinction between soft and average vocal effort has been eliminated Consequently the speech ISTS and ICRA signals are presented unfiltered for levels from 50 to 70 dB SPL At 75 dB SPL the spectrum is filtered to represent a loud vocal effort An own voice filter is also available at the 75 dB SPL level This is intended to produce a spectrum and level at a BTE microphone location similar to that produced by the voice of an average wearer A tone burst MPO stimulus provides 128 ms bursts with 128 ms gaps at 1 3 octaves with a level of 90 dB SPL in the test box and 85 dB SPL for on ear mode In test box mode all signals are filtered to include BTE ITE ITC CIC Body microphone location effects The selected overall rms level is established prior to filtering For fitting FM systems the stimuli may be modified to represent the level 84 dB SPL and spectrum at a chest microphone location and the level 93 dB SPL and spectrum at a boom microphone location These are presented in the test box in both on ear and test box modes The overall SPL 1 3rd octave band SPL vocal effort and microphone location effects are given in the following tables for the various broad band signals available Stimulus levels LTASS for standard speech is from Cox amp Moore 1988 Loud spectrum is from ANSI S3 5 1997 Own voice 112 Verifit User s Guide Version 3 12 May 2015
14. P 57 hole cpi e M 57 Spectral analysis ag Multicurve tee derent Ge uH Coe ERE ore RP RENE CIR ede phe NE Er RR teet ink va 58 Battery drain 69i io dr ERROR RED HRS BPO SRI IRE REI IU IR SERERE FOREN GE REYSUD SERERE ME Ta 58 Manual Comte procedures M 59 Sound level meter usie manual CODO rrt pnei rite eee ett ev reor eH e bee eer PO CE ese ERE PPS EE Fev a PUE PE ETE 60 11 Sensory OSs ginDipin A e 62 Sensory loss srmulator deseriptIOR iret ree tere voee tide te dt petente e A EPRNDER ER URN TEES EE re Peppe de ERE 62 Sensory l ss sim lat r Op ratiole ioraa 62 12 20n Bar NIGAS UTES SEIU Decio RE eR eee byte a E oE eere E pe A EE Eee ere Yee E e EEE ERAN 63 External soundsBeld speaker setup ero ee he rer ie res ree te e EAO RENEE EEEE RNS 63 Orn ear calibration LACUS yes iei pene RO oo dH e Lats CHEER UD te ob b v E PU Rd 63 Calibration of on ear probe TOHCFODhORe o ciere itenim ipee enr te ere tlete Aereo rate e aegre LE cgi Pe ue eee do rebua 64 Calibration check for probe module senc deret pto rte rete ana FEE EIE ia a an K E ERRTHH ETUR NUR E EEA EFIE Ease Rd 65 Max TM SPLSel p nonien tei rre e HDI EHE EE Er ee perite e Ee Deu Oe ebat eee Pede bob eee de Poe petu d 66 ABR nHL Tose HL setup 2 rerit t ee tren e inte ee POET eed Ea REDE e FOSTER PAS
15. Press Tests then highlight and lt PICK gt Test box measures then highlight and lt PICK gt Calibration Highlight then PICK Daily or Weekly to select the calibration interval Highlight and lt PICK gt Calibrate See Test box calibration facts It is recommended that you print a copy of the initial calibration curve and compare it with your daily or weekly curve Any change in this curve indicates a drift in either the coupler or the reference microphone which needs further investigation See Calibration check for coupler microphone for an additional check 41 Verifit User s Guide Version 3 12 May 2015 REFERENCE COUPLER BATTERY MIC MIC PILL Calibration check for coupler microphone Accuracy of test box measurements depends on the calibration of the coupler microphone This should be checked regularly using a microphone calibrator with an adapter ring The RE780 1 1 8 in and RE781 lin rings are designed for Quest CA22 and QC 10 20 respectively To verify the coupler microphone calibration 1 2 3 4 Calibrate the test box reference microphone See Calibrating test box reference microphone Screw the appropriate calibrator ring onto the coupler microphone Insert the coupler microphone with the attached calibrator ring into the calibrator opening Turn the calibrator on and adjust it to present one of the available frequencies and levels e g 94 dB SPL at 1000 Hz Press lt T
16. The easiest way to meet both requirements is to run a Linear or AGC test before running this test See ANSI 1996 Linear and AGC tests ANSI 2003 Linear and AGC tests 1 Ge ee T First complete an ANSI Linear or AGC test then press lt Tests gt Highlight amp lt PICK gt Test box measures then highlight and lt PICK gt Telecoil Set the aid to T telecoil input Highlight and lt PICK gt Start TMFS test Test setup instructions are displayed Position the aid on the T inscribed on the test chamber floor BTE aids should lie as flat as possible on the test chamber surface while custom aids should be oriented with their faceplate parallel to the top surface if possible and touching it as shown Press lt Continue gt to start the test While maintaining the orientation of step 5 move the hearing instrument around on the test chamber surface to maximize the number shown in the Maximize Average SPLITS Value box Without moving the hearing instrument press lt Continue gt to store the Average HFA or SPA SPLITS value and run the SPLITS curve If an RTG has been previously obtained the STS or RSETS will be shown 49 Verifit User s Guide Version 3 12 May 2015 ANSI test loop test ANSI 53 22 requires that the gain control be set to RTP 1996 or RTS 2003 before running this test The reference test gain RTG is required in order to calculate the STS 1996 or RTLS 2003
17. The most common sensory loss is caused by outer hair cell damage and results in loss of audibility for soft sounds but near normal loudness for loud sounds nner hair cell damage elevates threshold and reduces loudness for both soft and loud sounds possibly somewhat more for soft sounds This sensory loss simulator SLS is intended to allow normal hearing listeners to hear sounds as if they had the elevated threshold and altered loudness perception caused by outer and inner hair cell damage It is based on the cochlear hearing loss model described in Moore amp Glasberg 2004 In this simulation losses less than 58 dB SPL are considered to be due entirely to outer hair cell damage Any loss greater than this is considered inner hair cell loss This SLS does not simulate broadening of the auditory filters or other distortions that may accompany cochlear hearing loss To properly experience the simulation listeners should be within 1m of the sound field speaker and in a quiet room Sensory loss simulator operation Listeners should be within 1m of the sound field speaker and in a quiet room 1 Press Tests then highlight and PICK Sensory loss simulator 2 If an audiogram has previously been entered in Speechmap or Insertion gain go to step 4 Otherwise highlight and lt PICK gt Audiometry 3 Enter HL threshold values using a mouse or the keypad Left click the mouse on the audiogram form to enter a point Click again
18. Verifit User s Guide Version 3 12 May 2015 Qu LBS edet uo Highlight and lt PICK gt a stimulus type from the list box Highlight and lt PICK gt a stimulus level from the list box Highlight and PICK Start test Highlight and lt PICK gt Continue to capture the comparison curve once the noise reduction function has responded Feedback suppression test This test shows the LTASS upper graph and the power concentration ratio PCR lower graph for a speech signal The PCR measures the degree to which a large amount of power is concentrated at a small number of frequencies in the hearing aid output see Freed amp Soli in References In the Verifit the PCR is the ratio of the average power of the dominant frequency components in a 1 12 octave band to the power in the entire band expressed in dB Because the gain of a compression hearing aid varies with the signal it is processing the PCR is calculated in real time while a speech signal is presented to the hearing aid The upper graph shows the LTASS for the speech signal while the lower graph shows the PCR relative to the PCR for speech without feedback Feedback results in a peak in the speech spectrum and in the PCR Incipient feedback results in a peak in the PCR curve 1 2 3 Press lt Tests gt then highlight and lt PICK gt Test box measures and highlight and lt PICK gt Feedback Highlight and lt PICK gt Test 1 and select a level of 50 or 60 dB With
19. 12 Verifit User s Guide Version 3 12 May 2015 Loud Sounds The Verifit is designed to produce sound pressure levels as high as 85 dB at the probe reference microphone Exposure to these levels for more than 7 hours can produce hearing damage When such levels are amplified by a hearing aid the level in the ear canal will be determined by the settings of the hearing aid but may reach levels that can produce hearing damage in less than 30 seconds To avoid this possibility 1 hearing aids should be adjusted to limit sound pressure levels to safe levels 2 the maximum TM SPL setting see Max TM SPL Setup should be used to terminate tests if an unsafe level is detected in the ear canal 3 test levels should be limited to 70 dB SPL except when necessary to verify the limiting levels of the hearing aid in which case the test should not last longer than 15 seconds 4 be aware of the test signal and patient reaction during a test and be prepared to respond to any sign of discomfort by reducing the SPL setting switching off the equipment or the hearing aid or removing the patient from the area When using the equipment to measure the Real Ear to Coupler Difference in small ear canals it is possible to induce a hearing loss if the test is allowed to continue for more than 1 hour Since accurate results can be obtained in less than 10 seconds this possibility should never occur in normal practice Power and Grounding This product
20. 5 Battery drain resolution 0 01 mA General ANSI 83 22 1996 and 2003 tests available Power source 100 240 V 50 60 Hz 250 VA em tees e Aea a ori panaka aaki pisii daas OSPL90 WM EEE E T2AL 250V uesasseneneneeriee nte eterne tios Full on Gain Overall dimensions eee uuesesseemmnnermmn nen nnnnnn nennen nnns Reference Test Gain A Rear main unit eem Frequency Response pc e Mr 14 5x16x6 5 in 36 8x40 6x16 5 cm eteneenreteee nnne nere neeneeieis Fl equency Range Vitale Gore bn ARP s NEAN E Test chamber fescestetersetectedenteresteveessideetesceesesscenee Maximum OSPL90 14x14 4x4 in 35 6x36 6x10 2 cm eee Harmonic Distortion Weight 5er be cte aee oo iy 17 6lb 8kg ieuna ee Attack amp Release time Display type fluorescent backlit active color eeeeAMMRIRIMMMRIRIHMHIIHR Equivalent Input Noise Display size 129 diagonal etienne ieira ersa Input Output Curves HesolUHoHau ueri oe pee nta 800x600 SVGA e Coupler SPL Telephone Simulator Printer 200 dots per inch thermal line printer Ree Simulated Telecoil Sensitivity Paper width S BOR Gudenedicisctendints Ant peat pact unti tec Battery Drain Headphone monitor amplifier 1 watt into 16 ohms Other tests available Power amplifiers 2 5watts each seeen Speechmap real speech audibility measures
21. Stimulus Chantiels speed t 2 Riese Real time adaptive directional verification Measurement channels sss D BW PANIIDO S Coupler SPL vs frequency Connectors 1 external monitor HDMI eeRRRRHmmmRHInI Coupler gain vs frequency 4 USB eene pectral analysis M EM ED ERE IRAN 1 Ethernet RJ45 eem NOISE reduction verification seid ibeieriein Feedback suppression verification eleva cedo tet weit eed Saee en Distortion vs frequency Test Box Manual measurement of output gain and distortion Working Space 11x5x1 5 in 28x12 7x3 8 cm SL ten ton a noise reduction and Speaker 2 2x3 in 5x7 5 cm independent Test box isolation 1KHz gt 25 dB Induction Coils per ANSI S3 22 2003 On Ear iss 1 Telephone Magnetic Field Simulator TMFS COTES 1 23 cm diameter test loop Speakers eed 2x 8 in 5x7 5 cm Battery Simulator per ANSI S3 22 2003 Probe modules 2 each containing probe amp ref Frequency Range sees 200 8000 Hz microphones Coupler microphone noise floor 200 8000 Hz 40 dB Probe microphone tube Silicone 1 mm diameter x 75 mm SPL Probe microphone noise floor 200 8000 Hz 45 dB 129 Verifit User s Guide Version 3 12 May 2015 SPL Frequency Range 200 to 8000 Hz Test Stimuli frequency modu
22. The easiest way to meet both requirements is to run a Linear or AGC test before running this test See ANSI 1996 Linear and AGC tests ANSI 2003 Linear and AGC tests 1 Dn wD b First complete an ANSI Linear or AGC test Press Tests then highlight and lt PICK gt Test box measures Highlight and lt PICK gt Telecoil Set the aid to T telecoil input Highlight and lt PICK gt Start test loop test Setup instructions will be displayed Position the hearing instrument on the T inscription on the test chamber floor vertically oriented as worn by a seated individual as shown Without moving the hearing instrument press Continue to run the SPL in a vertical magnetic field SPLIV curve or press Cancel to abort the test If an RTG has been previously obtained the TLS or RTLS will be shown Telecoil test results 50 Verifit User s Guide Version 3 12 May 2015 ANSI 3 22 2003 Telecoil audioscain Presentation Single view 110 Format Graph Scale dB SPL 100 l M a _ RefTest Gain 43 dB r pa su ia is Simulated telephone performance 90 E i a Start IMFS test bs t Telephone simulator pA Average SPLITS 87 0 dB j RSETS 16 0 4B 80 p i E i Test loop performance i Start test loop test is Ej f Test loop s Average SPLIV 95 0 dB RTLS 8 0 dB 60 t 1 L HFA SPA 1000 1600 2500 Hz NOTE Gain setto
23. adaptive function is activated and observable 118 Verifit User s Guide Version 3 12 May 2015 6 Press Continue to capture the directional curves and end the test Highlight and lt PICK gt Test 2 This is like Test 1 but without the speech If the directional response of the instrument is noise adaptive the curves will separate after 15 45 seconds A speech adaptive directional instrument will remain omni directional and no separation will be observed Press Continue to capture this directional test result and end the test Press Continue to close Directional and move to Noise reduction Viewport Noise reduction test 1 2 On either the Viewport Test box or On ear screen highlight and PICK Noise reduction Leave the setup in the test box or on ear as used for previous Viewport tests NOTE The rear speaker is not used for On Ear noise reduction tests Highlight and lt PICK gt Test 1 This will present a continuous noise at 70 dB and capture the hearing aid output within the first second as a heavy curve A real time output curve light will continue to be displayed and will drop as the noise reduction feature of the instrument takes effect A measure of the overall reduction in wideband RMS between the two curves is displayed as a noise reduction NR value to the right of the curves Press Continue to capture the curves and the NR result and end the test Highlight and lt PICK gt T
24. lt PICK gt the current Max TM SPL setting 3 Highlight and lt PICK gt the desired Max TM SPL setting from the drop down list 4 Press Continue to exit Setup This Max TM SPL setting will be in effect until you change it 66 Verifit User s Guide Version 3 12 May 2015 If the limit is exceeded during an on ear test the Verifit will terminate the test and display the message MAX TM SPL EXCEEDED You must then decide to either reduce the maximum output limit of the hearing instrument or increase the Max TM SPL setting following the steps above If the MAX TM SPL limit has been disabled a notice will appear on each real ear screen Also a message reminding you that the MAX TM SPL limit has been disabled will appear when you select an on ear test ABR nHL to eHL setup Estimated Hearing Level eHL An estimate of the behavioral pure tone threshold that accounts for a measured ABR threshold Normalized Hearing Level nHL a Stimulus peak to peak equivalent SPL pe SPL at ABR threshold relative to the average stimulus pe SPL at ABR threshold of a normal hearing jury OR b stimulus SPL at ABR threshold relative to the average stimulus SPL at behavioral threshold of a normal hearing jury for the same stimulus Note that in this latter case nHL is equivalent to eHL In Speechmap DSL you have the option of entering ABR thresholds in either eHL or nHL If eHL is selected the threshold is treated as if it were a behaviora
25. select Speech std 1 2 or the ISTS and choose FM chest 84 dB SPL or FM boom 93 dB SPL for the level Adjust the FM receiver gain volume settings to meet targets in the 1000 4000 Hz range Repeat step 3 at use volume setting CROS fitting in Speechmap See Using Speechmap 1 2 Place a probe module on each ear and insert the probe tube into the good ear only Position the CROS instruments on in the ears and turn them ON Position the speaker at 45 degrees to the good ear and set Instrument to BTE 108 Verifit User s Guide Version 3 12 May 2015 Speechmap 130 120 80 70 60 3 Select Test 1 and record a response using Pink noise at Soft 55 It should be like a normal REUR If not 1404 MaxTM SPL 120 250 500 1000 the ear may not be fully open 110 ei l Probe tub robe tube in 90 good eae 2000 4 Position the speaker at 45 degress to the poor ear 5 Set Instrument to CROS 6 Select Test 2 and obtain a response using Pink noise at Soft 55 Adjust the response to match that obtained in step 3 Position the speaker directly in front of the client Select Test 3 and use Pink noise at Soft 55 to check for a smooth response Repeat with Instrument set to BTE An irregular response may be the result of reflections from nearby objects including the operator or it may indicate phasing problems in the aids 4000 Soe nile on poor side 8000
26. 2nd or 3rd harmonics with input levels varying from 60 90 dB SPL It also presents the sum of 2nd and 3rd harmonics as total harmonic distortion THD For hearing aids this differs little from true THD 1 Press Tests then highlight and lt PICK gt Test box measures then highlight and pick Distortion 2 Refer to Coupling the hearing instrument Positioning the hearing instrument and Battery pill use and care to prepare the instrument Turn the hearing instrument ON Highlight and lt PICK gt Start test Highlight and lt PICK gt Harmonics then highlight and lt PICK gt THD 2nd or 3rd from the drop down list E ee Highlight and lt PICK gt Input then highlight and lt PICK gt the desired input level 60 90 dB SPL from the drop down list 7 Press Continue to run the test Distortion will be displayed at 1 3 octaves in graphic and in tabular form Noise reduction This test captures a response curve before the hearing instrument reacts to the presence of noise a comparison curve shows the hearing instrument reacting in real time The thick curve is the output before the noise reduction is activated and the thin line is the output as the noise reduction takes effect The test also provides an overall rms noise reduction value in dB 1 Press Tests then highlight and lt PICK gt Test box measures then highlight and pick Noise reduction 2 Highlight and lt PICK gt Test 1 2 or 3 52
27. 76 Target REIG xN gems naa er DUTT rcnt tee Hide Show 20 p a SII for target 0 Lu PALMS nU ov veau sues Cn REA UR E EE RES FO Poe aCe ra COE e Med dido a Gor e d Voile A DE A Dua 10 T Se Sy md CT SE FS S es ry est mes ee 250 500 1000 2000 4000 8000 1 Press lt Tests gt then highlight and lt PICK gt On ear measures then highlight and lt PICK gt Insertion gain 2 Highlight and lt PICK gt Instrument to chose from BTE ITE ITC CIC CROS Body This changes the CORFIG used for 2cc targets 3 Highlight and lt PICK gt fitting method to chose from FIG6 NAL NL1 NAL R POGO II Berger Libby User None 85 Verifit User s Guide Version 3 12 May 2015 Insertion gain in HL Refer to On Ear Measures Setup and On Ear Measures Screen Setup for terminology and information on preparing the system for use and for proper positioning of the client and the probe tube e 1 Press Tests then highlight and lt PICK gt On ear measures then highlight and lt PICK gt Insertion gain 2 Highlight and lt PICK gt Instrument to chose from BTE ITE ITC CIC CROS Body This changes the CORFIG used for 2cc targets 3 Highlight and lt PICK gt the fitting method button to chose from FIG6 NAL NL1 NAL RP POGO II BERGER LIBBY USER NONE An estimated aided threshold curve is calculated by shifting the unaided threshold curve upward by the REIG This estimate a
28. American National Standard Methods of Measurement of Real Ear Performance Characteristics of Hearing Aids ANSI S3 46 1997 New York American National Standards Institute American National Standards Institute 1996 American National Standard Specification of Hearing Aid Characteristics ANSI S3 22 1996 New York American National Standards Institute Bagatto M Moodie S T Scollie S Seewald R Moodie K S Pumford J amp Liu R 2005 Clinical protocols for hearing instrument fitting in the desired sensation level method Trends in Amplification 9 4 199 226 Bentler R A amp Pavlovic C V 1989 Transfer functions and correction factors used in hearing aid evaluation and research Ear and Hearing 10 10 58 63 Byrne D 1977 The speech spectrum Some aspects of its significance for hearing aid selection and evaluation British Journal of Audiology 11 40 46 Cole W A amp Sinclair S T 1998 The Audioscan RM500 Speechmap DSL fitting system Trends in Amplification 3 4 125 139 Corliss E L R 1990 The ear as a mechanism of communication Journal of Audio Engineering Society 38 9 640 652 Cornelisse L E Gagne J P amp Seewald R C 1991 Ear level recordings of the long term average spectrum of speech Ear and Hearing 12 1 47 54 Cornelisse L E Gagne J P amp Seewald R C 1991 Long term average speech spectrum at chest level microphone location Journal of Speech Language
29. Ensure that Obtain an IP address automatically is selected Static connection A static connection requires an Ethernet switch The Network addresses must be entered manually into the Verifit and into the computer s Windows network setup 1 Connect a Cat 5 RJ 45 cable from one port on the Ethernet switch to the Verifit network connector 2 Connect a second cable from another port on the Ethernet switch to the computer s network connector 3 In Windows 7 go to Control Panel Network and Sharing Center then select Change Adapter Settings on the left hand panel 4 Right click on Local Area Connection and choose Properties Ensure that Internet Protocol TCP IP or TCP IPv4 is checked Select this and select the Properties button 5 Check Use the following IP address and enter the following in the IP address box 172 30 1 1 Enter 29 Verifit User s Guide Version 3 12 May 2015 255 255 255 0 in the Subnet mask box 6 On the Verifit un check Auto use DHCP on the Setup network screen and click the Change button Then set the network addresses as shown below by clicking on the down arrow buttons and selecting from the drop down lists 7 On the Verifit uncheck Auto on the Setup network screen and click the Change button Then set as shown below by clicking on the down arrow buttons and selecting from the drop down lists Change network address IP Address 172 v 30 F a m2 ej Network 172 i30 wil 1 wilo iij
30. LOUD VOCAL EFFORT EFFECT re nominal band SPL 15 00 10 00 BAND SPL dB re NOMINAL un S 0 00 5 00 200 250 315 400 500 630 800 1000 1250 1600 2000 2500 3150 4000 5000 6300 8000 BAND CEN TER FREQUENCY Hz Figure 5 Loud vocal effort effect in dB re nominal band levels Nominal band levels are band levels for an overall SPL of 65 dB This shaping is applied to the 75 dB SPL speech and ICRA signals MICROPHONE LOCATION EFFECTS re nominal band SPL 1 k BTE MIC LOCATION ITE MIC LOCATION ITC MIC LOCATION e CIC MIC LOCATION BODY AID MIC LOCATION FM CHEST MIC LOCATION E FM BOOM MIC LOCATION BAND SPL dB re NOMINAL 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 BAND CENTER FREQUENCY Hz Figure 6 Microphone location effects in dB renominal band SPL Nominal band levels are band levels for an overall rms level of 65 dB SPL and average vocal effort in a free sound field In addition to these well controlled and repeatable signals live speech may be used as a test signal It will of course be unequalized and at an uncontrolled level 3 Analysis of broad band signals Broad band signals contain energy at many frequen cies simultaneously Such signals are usually analyzed in a series of narrow frequency bands to produce a spectrum The auditory system functions on a loga rithmic frequency scale and analyzes broad band sig nals in critical bands which approxi
31. Pathology and Audiology 15 3 7 12 Cornelisse L E Seewald R C amp Jamieson D G 1994 Wide dynamic range compression hearing aids The DSL i o approach The Hearing Journal 47 10 23 29 Cornelisse L E Seewald R C amp Jamieson D G 1995 The input output I O formula A theoretical approach to the fitting of personal amplification devices Journal of the Acoustical Society of America 97 3 1854 1684 Cox R M amp Moore J N 1988 Composite speech spectrum for hearing aid gain prescriptions Journal of Speech and Hearing Research 31 102 107 Dunn H K amp White D S 1940 Statistical measurements on conversational speech Journal of the Acoustical Society of America 11 278 288 Feigin J A Kopun J G Stelmachowicz P G amp Gorga M P 1989 Probe tube microphone measures of ear canal sound pressure levels in infants and children Ear and Hearing 10 4 254 258 Fikret Pasa S amp Revit L J 1992 Three experiments to validate new probe measurement practices in prescribing customized hearing aids Journal of Speech and Hearing Research 35 384 400 Freed D J amp Soli S D 2006 An objective procedure for evaluation of adaptive antifeedback algorithms in hearing aids Ear amp Hearing 27 4 Hawkins D B Cooper W A amp Thompson D J 1990 Comparisons among SPLs in Real Ears 2cc and 6cc couplers Journal of the American Academy of Audiology 1 154 161 137 Ve
32. Printing to USB memory 1 Plug a USB memory stick into one of the USB ports on the rear connector panel The Verifit may be either on or off 2 Press lt Setup gt then highlight and lt PICK gt Printing 3 Highlight and lt PICK gt Print to USB file 4 Highlight and lt PICK gt Printer details to change the file type Bitmap bmp or Internet GIF gif and the captured area Full screen Main window full screen without the message line or Active window foreground image only 5 Press lt Continue gt to save the settings and exit the setup menu 6 To save a screen image to a file press lt Print gt Do not unplug the USB stick until the Accessing USB stick message disappears NOTE To input a file name from a connected keyboard each time you print see Barcodes tabular data 33 Verifit User s Guide Version 3 12 May 2015 headers and comments on printouts NOTE To save all test data as an xml file see Storing and restoring data Network printer setup To print to a network printer or to a Windows shared printer on the network you must first enable networking See section Networking To print to a printer on a Windows PC connected to a network you must also share the printer on the PC by selecting Start Settings and Printers Then right click on the printer you wish to share and select Sharing Only PCL 3 not PCL3GUI PCL 5 PostScript compatible printers are supported as well as HP Las
33. RTS m AGC set for minimum effect a a a ey Sn Dey ery reer Pues esses tdm ere Cy ey msi 250 500 1000 2000 4000 8000 51 Verifit User s Guide Version 3 12 May 2015 10 Other Test Box Measures In addition to the tests of ANSI S3 22 the Verifit also provides the following tests in the test box Manual control Coupler and test box reference mic SPL and coupler mic distortion at selected 1 12th octave frequencies and stimulus SPL of 0 and 40 90 dB in 5 dB steps Can be used as a dual channel sound level meter with 1 12th octave A and C filters Feedback Reduction This test is a before and after comparison of curves with the hearing instrument feedback reduction deactivated vs activated Directional A real time assessment of directional performance by analyzing the response to the left and right speakers Distortion Harmonic distortion at 2nd or 3rd harmonics and 2nd plus 3rd with input levels varying from 60 90 dB SPL Multicurve 1 4 curves of coupler SPL or coupler gain for swept tones or pink noise in 1 12th octaves at selected input SPL of 0 or 40 to 90 dB in 5 dB steps Can be used as a 1 12th octave spectrum analyzer by setting stimulus to 0 dB Battery drain A 10 second test of battery current drain with no acoustic input a 1 kHz 65 dB input SPL and an average for 90 dB input SPL at the HFA or SPA frequencies selected in Setup Harmonic distortion This test measures harmonic distortion at
34. TUNE dual direction noise calibrated or live speech ngn Test stimulus levels 40 to 90 dB SPL in 5 dB steps S pec ifi cat l O ns Test stimulus levels inductive 31 6mA m ANSI S3 22 Test stimulus distortion 296 at 90dB SPL Specifications subject to change without notice sssssemRRIRIHMRMReReee 0 596 at 70 dB SPL Test stimulus accuracy at reference mic for tones IRI 200 2000E2 iterat 1 5 dB SPL Environmental conditions 2000 8000 Hz eee 2 5 dB SPL STORAGE amp TRANSPORTATION Equalization method iue real time pressure method Analysis frequencies per octave 12 Analysis filter bandwidth 1 12 octave Temperatu re 20 Es C to Measurement accuracy at 1 kHz 1db 60 S C Measurement accuracy re 1 kHz 1 dB 200 5000 Hz TOU XE iether diu 2 5 dB 5000 8000 Hz Lm i Measurement range 30 140 dB SPL Relative humidity non condensing 5 to 95 Harmonic distortion measurement 2nd 3rd OPERATING A me D E or 2nd plus 3rd Temperature 15 C 19 30 C Harmonic distortion range 200 to 4000 Hz Relative Humidity Misi SS ele ae 20 50 Harmonic distortion accuracy 1 Atmospheric Pressure 81 106 kPa Battery drain range sesssuuusse 0 20mA Altitude 3h iios below 2000 m Battery drain accuracy
35. Weekly Mon Jan 12 1 00am Expires Measure real ear Real ear HA 1 RECD Avg HA 1 RECD 70 Verifit User s Guide Version 3 12 May 2015 Graph table or 2cc target format Most on ear test screens may be viewed in graphic or tabular format In RECD and Directional tests highlight and PICK Format to toggle between Graph and Table views In Speechmap and Insertion gain highlight and lt PICK gt Format then highlight and lt PICK gt Graph Table or 2cc targets from the drop down list In 2cc targets format reserve gain and fitting formula may be changed Highlight amp lt PICK gt the appropriate window then highlight amp lt PICK gt the reserve gain or fitting formula from the drop down list In Speechmap if DSL or NAL NLI has been selected as a target method then 2cc coupler targets for user gain full on gain and OSPL90 are provided The full on gain is just the user gain plus the reserve gain If no target method has been selected only 2cc OSPL90 values are indicated Target gains are for speech like signals at a 70 dB input SPL OSPL90 targets are for 90 dB pure tones On ear targets are converted to 2cc coupler values by using age appropriate average or measured if available RECD values and the appropriate microphone location effects for the desired style of hearing instrument The gain values given assume the hearing instrument is linear for a 70 dB spee
36. a USB port to enter threshold UCL and RECD data directly from Audioscan printouts Barcoded threshold data printed by some Grason Stadler audiometric equipment may also be scanned Scanners other than that supplied by Audioscan may not work and are not supported by Audioscan Monitor headphones The monitor headphones supplied with the Verifit may be used to listen to the signal being measured by the coupler or the probe microphone This is useful for l listening to the hearing aid to troubleshoot sound quality complaints 2 listening to the wearer s own voice to troubleshoot occlusion effect complaints 3 verifying program settings and their notification beeps 4 demonstrating a variety of hearing aid features to parents teachers and significant others Plug the headphones into the jack marked Headphones on the right side of the test chamber near the front The volume may be adjusted using the volume wheel located next to the headphone jack Rotating it toward the front of the test chamber increases the volume e Failure to follow operating instructions could place the user or operator at risk External peripherals Serial number 4671 and higher An external video monitor HDMI or DVI with adapter may be connected to the HDMI connector on the rear of the main display unit The internal display and external monitor will operate simultaneously The external monitor must be capable of displaying 800 x 600 at a refresh rate
37. air cells because of a tight seal on the battery compartment Try using a fresh battery The test box reference microphone the white one in the sound chamber is incorrectly positioned In order to control sound pressure levels precisely at the microphone inlet of the hearing instrument the test box reference microphone must be positioned as close as possible to the hearing instrument s microphone without actually touching it The noise or feedback reduction features are attempting to reject the test signal These need to be disabled prior to tests with tones or noise The instrument is on the verge of feedback due to a poor seal to the coupler unplugged vent or a crack in the tubing on the BTE coupler Test box curves differ from specifications The OSPL90 and response curves don t look like the manufacturer s Check that all controls or program settings are the same as those used by the manufacturer Check that vents on earmolds or ITE instruments are plugged at the faceplate Check that ITE instruments are well sealed to the coupler When puttying a hearing instrument into the ITE coupler be sure to keep the canal portion of the instrument flush with the inside of the 2cc volume Ensure that the test box is sealed tightly Ensure that the test box microphone calibration was performed correctly Check that the coupler is screwed tightly onto the coupler microphone 124 Verifit User s Guide Version 3 12 May 2015 Test
38. be added 1 Connect a computer keyboard to one of the USB ports on the rear connector panel Press Setup then highlight and lt PICK gt Printing Highlight Page setup and press lt PICK gt to display the page setup poster To print the date and time on each printout highlight and lt PICK gt Date To print ines for handwritten notes highlight and PICK Lines To add barcodes for audiometric data highlight and lt PICK gt Barcode To add tabular data highlight and lt PICK gt Graph with table OO XUI Men vEe spas LED To print a fixed header on printouts highlight and PICK Header Enter the desired header up to 35 characters on the connected keyboard Press lt PICK gt or Enter on the keyboard number pad to complete the entry To be prompted for a new header for each printout highlight and PICK Ask 9 To print fixed comments following a printout highlight and PICK Description Enter comments on the connected keyboard Press lt PICK gt or Enter on the keyboard number pad to complete the entry To be prompted for new comments for each printout highlight and PICK Ask 10 To be prompted for a new file name each time you print to a USB memory stick or a network file highlight and lt PICK gt Ask Do not use space or tab in the file name USB file names are limited to 8 characters See Printing to a USB memory stick or Printing to a network file 11 A print layout for
39. being applied Calibration of on ear probe microphone Ensure the probe microphone assembly to be calibrated is plugged into the appropriate jack See Microphone connection and On ear calibration facts 1 Press Tests then highlight amp lt PICK gt On ear measures then highlight amp PICK Calibration 2 Press the enlarged end of a probe tube as far as it will go into the recessed opening at the top of the probe module 3 Position the open end of the probe tube in front of the reference microphone inlet and press it between the posts as shown 4 Hold the probe module 15 90 cm 6 36 inches away from and directly in front of the sound field loudspeaker Orientation of the probe module is not critical 5 Press lt PICK gt to calibrate The resulting curve should be similar in shape to that shown but may be shifted 64 Verifit User s Guide Version 3 12 May 2015 5 dB To change the calibration interval highlight amp PICK Daily or Weekly 20 10 eee 10 Press lt Left Right gt and repeat the process for the other probe module Calibration check for probe module The calibration curve for the probe module is a comparison of the response of the probe microphone with tube to the response of the on ear reference microphone Any change in the curve indicates a change in one of these microphones or the probe tube See Calibration of on ear probe microphone As part of a regular
40. c ia re ai daet a iad epo 3 Speech ISTS Ava 70 69 4 0 i Unaided avg 65 25 250 500 1000 2000 4000 8000 Open fittings in Speechmap On ear mode should be used for open and vented fittings There are no special real ear SPL targets for open fittings it doesn t matter how the sound reaches the TM the perception is the same However the sound that escapes from a vent or open fitting may be detected by the on ear reference microphone interfering with the sound field equalization For this reason the hearing instrument must be muted during sound field equalization 1 Position the client and probe tube and enter audiometric data See On Ear Measures Setup Speechmap Speechmap Fitting Procedures 2 Highlight and PICK Instrument and select Open from the list 3 Highlight and lt PICK gt Test 1 4 If this is the first Open test in a session you will be prompted to mute or turn off the hearing instrument and select the Equalize button on the setup poster Otherwise you are reminded to equalize whenever the client or nearby objects are moved After equalization unmute or turn the instrument on and follow the fitting procedures in Fitting to targets for soft speech to Fitting to targets for mid level speech Verifying Frequency Compression Frequency Lowering Hearing Instruments in Speechmap Frequency lowering is used when it is not possible to amplify the high frequency components of speech 105 Verifit
41. cables should not be used They will substantially increase noise levels 15 Verifit User s Guide Version 3 12 May 2015 General care instructions Probe tubes are for single patient use only They may be wiped with alcohol wipes for re use with the same patient but must not be used with multiple patients Attempts at ultrasonic cleaning usually result in cerumen becoming lodged in the lateral end which causes irreparable damage to the probe microphones The case can normally be cleaned dusted with a damp cloth however if it is soiled we recommend wiping with a mild solution of water and detergent or with alcohol impregnated wipes deemed safe for use on electronic equipment Parts that come into contact with patients the probe module body cable and blue lanyard should be regularly wiped down with alcohol wipes Hearing instruments should be cleaned prior to introduction to the test chamber due to the difficulty of sanitizing the acoustic foam Custom hearing instruments must be cleaned with disinfectant towlettes i e audiowipes prior to placing in the test for this reason and to minimize contamination of the blue putty used with the HA 1 coupler The acoustic foam in the floor of the test chamber is easily removed and should be replaced if badly worn or soiled The foam floor in the Verifit test chamber is printed on both sides and may be flipped over to double its life Audioscan recommends periodic replacement of the blue put
42. calibration schedule or to investigate changing calibration curves the on ear reference microphone may be checked against a high quality sound level meter 1 Qv Ce Ee pss o9 3 Press Tests then highlight and lt PICK gt On ear measures then highlight and lt PICK gt Manual control Highlight amp lt PICK gt Level then highlight amp lt PICK gt 70 from the drop down list Highlight and lt PICK gt Frequency then highlight and lt PICK gt 2000 Hz from the drop down list Highlight then lt PICK gt Start test which changes to Stop test Hold the probe module about 18 in 0 5 m in front of the sound field speaker Hold the microphone of a calibrated sound level meter next to the on ear reference microphone as shown Set the sound level meter to C weighting and slow The sound level meter should read 70 2 dB Repeat with the frequency at 250 Hz To stop the measurement highlight and lt PICK gt Stop test 65 Verifit User s Guide Version 3 12 May 2015 The probe module should be replaced if it fails this test Max TM SPL setup The Max TM SPL safety feature allows you to set a limit on the SPL measured by the probe microphone above which a test terminates The MAX TM SPL limit is shown on all on ear measurement screens The default limit is 120 dB To choose a different Max TM SPL setting 1 Press Setup then highlight and lt PICK gt Max TM SPL 2 Highlight and
43. changed in several ways Most screens may be viewed as a single full screen or dual side by side panels Most screens may be formatted to show results in graphical or tabular format The Multicurve screen may be scaled in dB SPL or dB Gain Individual curves may be hidden but not erased Test box screen Except for Viewport Input Output Battery drain and Manual control screens you have the option of selecting either a single full screen view or a dual side by side view Some data may be dropped from the dual view To change the presentation highlight then lt PICK gt Single view or Dual view To switch between A and B test panel in single or dual view press lt Left Right gt In dual view you may switch panels by left clicking the mouse on a screen button in the inactive test panel However this also operates the button Multicurve audioscan 80 s ih 80 i 3 j R 70 60 50 40 30 20 lt SUS ed REDI ee ee 3 SSS So ee ee eS ee ee 250 500 1000 2000 4000 8000 250 500 1000 2000 4000 8000 Dual view m Test Stimulus Level Dual view Ll Test Stimulus Level Graph Jg aj Pink noise 50 Graph J a Pink noise 40 Scale dB Gain 2 Pink noise 60 Scale dB SPL 2 Swept 40 3 Pink noise 70 3 4 Pink noise 80 4 Curve Hide Show Curve Hide Show 38 Verifit User s Guide Version 3 12 May 2015 Format Except for Viewport Distortion Input Output B
44. contains numerous safety features to ensure that the probability of electrical shock is as low as reasonably practicable In order to ensure that all of the safety features work optimally you must ensure that the power cord is plugged into a grounded outlet Any line powered peripherals connected to the Verifit must comply with UL IEC 60601 1 OR comply with UL or IEC or ISO safety standards for such equipment AND a be operated from an isolating transformer complying with UL IEC 60601 1 OR b be kept at least 6 feet 1 8m from the patient Ear Infection Probe tubes or RECD foam tips should not be re used on another patient There is a possibility of transferring an ear infection to the other patient Probe tubes and RECD foam tips are for single patient use only Do not attempt to clean or re use Ear Canal Discomfort An otoscopic examination should always be performed prior to inserting a probe tube into the ear canal to ensure that it is healthy and free of obstructions Care is needed when inserting probe tubes into the ear canal Although the probe tubes are made of soft flexible material specially designed for this application it is possible to scrape the ear canal or touch the eardrum causing brief discomfort You should carefully follow the instructions in Positioning the probe tube section of this User s Guide 13 Verifit User s Guide Version 3 12 May 2015 Getting Started This section provides instructions for unp
45. data choices 2 Press Continue to proceed to data entry Enter HL threshold using a mouse keypad or keyboard Left click the mouse on the audiogram to enter a point Click again to delete the point On the keypad the arrow keys change frequency and level and lt PICK gt enters or deletes a threshold point On a keyboard enter HL values on the numeric keypad Press Continue when all points have been entered Repeat the process for Bone conduction UCL and RECD if Enter has been selected for any If RECD is set to Measure see RECD real ear to coupler difference Audiometry Ear Left Targets DSL child Age 9 years HL transducer Insert Foam vj Threshold Entered Bone conduction N A Ll UCL Average Ll RECD Enter RECD coupling Earmold Ll Cancel e Continue e Help e 101 Verifit User s Guide Version 3 12 May 2015 Assessment data choices The following audiometric assessment parameters can be specified in the Speechmap Audiometry setup box Defaults are the last used choices if test setup memory has been turned on See Saving test setup 1 Target Select fitting targets from DSL adult DSL child NAL NL1 NAL NL2 Camfit restoration Camfit equalization None See DSL 5 0 in Speechmap NAL NLI in Speechmap NAL NL2 in Speechmap Camfit in Speechmap Age This is permitted for DSL child and NAL NL2 targets only Select client s age in months from 1 months to 6
46. digital functions and counsel patients NOTE Within a given Verifit session if you have already performed separate Speechmap Directional Noise reduction or Feedback tests using the Test box or On ear measures menu these results will automatically populate the appropriate Viewport quadrants However only results of Speechmap Tests 1 3 are visible in the Audibility quadrant of Viewport and only results of Tests 1 and 2 from Directional Noise reduction and or Feedback tests are visible in their respective Viewport quadrants Viewport Audibility test 1 On the Viewport screen highlight and lt PICK gt Audibility You can either work with the existing session data that appears scan a previously acquired threshold barcode or enter new threshold data To enter new thresholds highlight and lt PICK gt Audiometry Enter HL thresholds using a mouse or the keypad Left click the mouse on the audiogram to enter a point Click again to delete the point On the keypad the arrow keys change frequency and level and lt PICK gt enters or deletes a threshold point Press lt Continue gt when all points have been entered For Test box measures position the hearing aid in the test box See Positioning the Hearing Instrument in Test Box Measures For On ear measures position the client probe module and probe tube and insert the earmold or hearing aid into the test ear See Positioning the Client Positioning the Probe Tube in On Ear Measures
47. ear mode or FM This changes microphone location effects and the RECD used in test box measures and 2cc targets and the reference microphone used for FM and CROS In the case of a CIC a deep insertion factor is applied to the estimated ear canal SPL To enter audiometric data see Assessment data entry display the data See Screen tour amp Speechmap Fitting Procedures Speechmap Setup Speechmap provides a number of different test stimuli for fitting hearing aids and testing various aspects of their performance Each time you run a test you have the opportunity to select the stimulus from a list You can manage which stimuli appear on this list by doing the following Press Setup then highlight and lt PICK gt Speechmap The available Speechmap stimuli are in two columns The left hand column contains the MPO stimulus and speech stimuli that have the specific Long Term Average Speech Spectrum LTASS required when matching prescription fitting targets such as DSL NAL NL1 or NAL NL2 The MPO stimulus used to verify that the maximum output SPL of the hearing aid does not exceed the uncomfortable level is always selected You must Setup Speechmap Hide speech envelopes automatically Choose Speechmap stimuli MPO i Speech female Speech std 1 7 Speech child LI LJ Speech std 2 Speech live Og SpeechtSTS Speech3150 Og Speech4000 I LJ
48. easily be converted to match these specifications using your preferred audio editing software Leveling Options By default Speechmap will automatically level the WAV file so that the Long Term Spectrum matches the level selected for the test The automatic leveling of the WAV file can be modified by inserting a tag in the filename This feature allows you to fine tune the output level of your stimulus The tag must be added at the end of the filename but before the extension Example filename 42 5 wav The tag must consist of an underscore followed by a plus or minus sign followed by the modifier in dB In the example above the tag 2 5 will level the file to be 2 5 dB above nominal There are no restrictions on the magnitude of the modifier there is built in protection against speaker overdrive Precision is limited only by the 15 character limit of the filename 99 Verifit User s Guide Version 3 12 May 2015 Speechmap Jan 18 2012 10 18am audioscan 140 Yay Instrument BTE 130 Mode Testbox Presentation Single view m Format Graph ha 110 Scale dB SPL ng 100 Audiometry 90 Age Adult 80 Transducer Headphone UCL Average 70 RECD Average 60 up EE EE RN BCT NIA CAT EEE Binaural No l l l l l REDD Average 40 30 Test Stimulus Level SII A l 13 user Avg 65 100 MN a 2 user 4 Avg 65 100 O o0 o V V ve 9e 377 user42 Avg 65 100 0 aN Unaided a
49. for viewing When you have finished copying the file from the USB flash drive click on the safely remove icon on your PC and remove the flash drive when you are notified that it is safe to do so STORE THE UPDATER USB FLASH DRIVE IN A SAFE PLACE YOU WILL REQUIRE IT TO INSTALL FUTURE SOFTWARE UPDATES If your Verifit has a CD drive serial less than 4671 a printable User s Guide will be on the update CD ROM which was mailed to you on request or which you created from a software download from www audioscan com To view the User s Guide l Insert the CD ROM into the CD drive on your PC 2 Select My Computer then the CD drive and the User s Guide folder 3 Double click the english folder and copy the Verifit Users Guide pdf file to an appropriate location on your PC Double click on the file to open it for viewing The User s Guide may also be downloaded from www audioscan com See Software updating for instructions on installing and removing the CD ROM How to Avoid Undesirable Side Effects During the development of the hearing aid analyzer Audioscan performed a rigorous Risk Assessment to identify any undesirable side effects that a user could be exposed to during the use of the Verifit and incorporated numerous risk reduction design elements into the Verifit to minimize the risk to users and patients Following are the actions which a user should take to ensure that these risk control measures continue to be effective
50. hearing instrument for Test box Speechmap The ANSI S3 46 2013 standard specifies RECD referenced to the HA 1 coupler and suggests its use in test box verification for all instrument types Audioscan software allows for BTE coupling to either HA 1 through earmold or HA 2 with a software correction BTE instruments may be coupled either directly to the HA 2 BTE coupler or to the HA 1 coupler using the client s earmold and blue putty When using the earmold ensure that the mold is well sealed to the coupler and that the medial end is flush with the inside of the coupler opening Putty should not extend into the coupler cavity or block the sound outlet Vents should be sealed at the lateral end Coupling method used for BTE instruments HA 2 or HA 1 must be specified in Instrument type selection on Speechmap screen See Using Speechmap RECD Custom instruments are sealed to the HA 1 coupler with putty so that the end of the eartip is flush with the 43 Verifit User s Guide Version 3 12 May 2015 inside of the coupler opening Putty should not extend into the coupler cavity or block the sound outlet of the instrument Vents should be sealed at the faceplate end It is very important that the instrument be well sealed to the coupler Open fit instruments may not be verified using Test box speechmap RITE Receiver in the ear instruments are coupled to the HA 1 coupler using putty to seal the receiver module or soft tip to the couple
51. is 2 to 5 mm from the eardrum 68 Verifit User s Guide Version 3 12 May 2015 Probe tube insertion The blue lanyard holds the tube in place and the depth marker is at the intertragal notch 69 Verifit User s Guide Version 3 12 May 2015 13 On Ear Measures Screen Setup To accommodate your working preferences the appearance of On ear measurement screens may be changed in several ways On ear single or dual view Most on ear screens give you the option of selecting either a single full screen view or a dual side by side view Some data may be dropped from the dual view To change the presentation highlight then PICK Single view or Dual view To switch between left and right test panel in single view press lt Left Right gt To switch between left and right test panel in dual view press lt Left Right gt or left click the mouse on a screen button in the inactive test panel RECD Max TM SPL 120 Max TM SPI 120 Active test panel 250 500 1000 2000 4000 8000 Dual view 250 500 SPL 4000 8000 Age Adut RECD coupling Foam tip Scale Graph Li Format Format Graph LJ Calibrate RECD transducer RECD xdcr cal Last Wed Jan 7 8 55am Interval Weekly Expires Mon Jan 12 1 00am Measure real ear Real ear HA 1 RECD Avg HA 1 RECD Calibrate RECD transducer RECD xdcr cal Last Wed Jan 7 8 55am Interval
52. menu Note that only the LTASS is shown for these stimuli and targets if selected have been suppressed 5 Press Continue to measure and store the long term signal averaged result If the isolated band does not appear in the Test 1 curve it may indicate that the hearing aid has no gain at the selected band frequency This does not mean that the hearing aid will be unable to transpose the band to a lower frequency when frequency lowering is enabled 6 Program the hearing instrument to activate the frequency lowering feature 106 Verifit User s Guide Version 3 12 May 2015 Sp 140 130 120 110 100 90 80 70 60 50 40 30 20 FM 7 Select Test 2 and select the same stimulus and stimulus level used in Test 1 8 Press lt Continue gt to measure and store the long term signal averaged result 9 The isolated band should now appear at a lower frequency and should reach or exceed threshold at its new location as shown below Note that the cavity between 1 kHz and the isolated band may be partially or completely filled in by noise within the hearing aid which will make the isolated band appear less distinct in the test curves 10 Once the frequency lowering properties of the hearing instrument have been verified use one of the Speech std stimuli to verify aided speech audibility or target match as described elsewhere in this section for frequencies below the isolated band
53. of 60Hz Ensure that the external display is powered up and set to the correct input prior to powering on the Verifit An external printer may be connected to one of the USB ports It may be color or black amp white but it must be PCL3 PCL 5 or Postscript compatible Serial number below 4671 Verifits with serial number below 4671 have 15 pin VGA monitor output which operates simultaneously with the internal display An external printer may be connected to one of the USB ports or to the parallel port It may be color or black amp white but it must be PCL3 PCL 5 or Postscript compatible The external printer must first be selected in Setup See Printing and Storing Results Connectors for external front and back sound field speakers are provided The VA 111 external speaker with a multipurpose folding stand is available from Audioscan but any small non powered 4 8 ohm speaker having a smooth frequency response and good efficiency may be used The rear external speaker is automatically selected when required by a test but the front speaker must first be selected in Setup See External sound field speaker setup 18 Verifit User s Guide Version 3 12 May 2015 USB HDMI Ethernet USB Sound field Spkrs Aux Audio USB Monitor LAN USB Front Back Left Right Verifit connector panel serial number 4671 and higher Mouse amp External Parallel RS232 Ethernet qe See Spkrs Aux Audio roi Keyboard Monitor Printer Se
54. of the most used measures of a speech signal is the long term average speech spectrum LTASS This is a 1 3 octave spectrum averaged over a sufficiently long portion of the speech material to provide a stable curve In practice a 10 second average meets this requirement and for this reason all Verifit passages are at least 10 seconds long The dynamic nature of speech is often characterized by the distribution of short term levels in each 1 3 octave band These levels are determined by calculating a spectrum for each of a series of short time periods within the passage Historically time periods of 120 125 or 128 ms have been used The Verifit uses a 128 ms time period resulting in 100 levels or samples in each 1 3 octave band for a 12 8 second passage The level in each band that is exceeded by 1 of the samples called L1 or 99th percentile has historically been referred to as the speech peak for that band The curve of the 99th percentile is approximately 12 dB above the LTASS The level in each band that is exceeded by 70 of the samples called L70 or 30th percentile has historically been called the valley of speech for that band The curve of the 30th percentiles is approximately 18 dB below the LTASS The region between these two curves is often called the speech region speech envelope or speech banana The speech envelope when derived in this way has significance in terms of both speech detection and speech understanding Generally sp
55. paper 1 Lift the printer head using the small black lever to the left of the printer 2 Remove the empty spool from the paper tray and any remaining paper from the printer NA y ERA 3 Hold a new roll in front of the paper tray with paper feeding from the top of roll 31 Verifit User s Guide Version 3 12 May 2015 Insert the paper s leading edge into the lower slot at rear of tray Feed the paper by highlighting the on screen Paper Feed button and pressing lt PICK gt Advance the paper until it comes out of the upper slot Place the roll in the paper tray and advance another foot of paper 90 mb OV uum Lower the printer head using the small black lever Press Continue If nothing shows on the paper when you press Print and the paper is coming out check that the glossy side is up as it comes out of the printer Unused thermal paper may darken if stored for prolonged periods at elevated temperatures and lose contrast if subjected to light Keep long term supplies in a cool dry place out of direct light Barcodes tabular data headers and comments on printouts The date and a header such as a facility name may be added to printouts Barcodes representing hearing threshold UCL and RECD where applicable may be added to printouts of Viewport Speechmap Insertion gain and RECD tests Tabular data where applicable may be appended to printouts Lines for hand written notes or typed comments may also
56. part that you can quickly and easily replace yourself Self test failures Any failure during power on self test P O S T is indicated on screen and further use of the instrument is denied Try the following steps to resolve the failure 1 To access Self test press Setup then highlight and lt PICK gt Self test 2 If you received a Max out in or a Routing failure remove any hearing aids from the test chamber unplug the monitor headphones if used and rerun self test 3 Check that the cables from the rear display unit to the test chamber and that the test box reference microphone are firmly plugged in Rerun self test 4 Unplug all microphones On ear amp Test box from the test chamber Rerun self test If self test passes reconnect the microphones one by one running self test each time until a failure occurs If the failure returns display and print the test results and contact Audioscan for help Setup selftest ES Pick this button Routing to display and Pick this button Gain print test results to rerun self test Frequency response Noise floor Max out in Distortion Crosstalk led ed ed ed Ie ed BA Initialize Function Initializing your Audioscan unit will reset it to default factory settings This erases the user preference files stored in internal memory Any custom printer choice network settings test setups will need to be re entered and the user calibrations will also be requi
57. response may be the result of reflections from nearby objects including the operator or it may indicate phasing problems in the aids Insertion gain audioscan 1405 Max TM SPL 120 ry Instrument CROS iw n Presentation Single view Format Graph v 120 Scale dB SPL J 110 l 7 Sd eu O O Audiometry Probe tube in CROS Transducer Headphone a N mi SS 90 good ear mic on REUR Average poor side REAR 70 i f f REIG Stimulus Level SII 60 Pink noise 55 98 Pink noise 55 99 50 9 Pink noise 55 100 Curve Hide Show 10 0 E 10 a LEER Eee posed nee m ESSE posee Sa ai La i Uoc ere 250 500 1000 2000 4000 8000 90 Verifit User s Guide Version 3 12 May 2015 18 Speechmap Speechmap presents hearing threshold UCL and amplified speech spectra as SPL in the ear canal The fitting goal is to make amplified speech audible and comfortable while avoiding discomfort for loud sounds Speechmap may be accessed from the Tests menu as either a Test box measure or an On ear measure See On ear or Test box mode for details Speechmap is normally used in SPL and this guide describes only this usage See SPL or HL scale for details Speechmap facts Speechmap is a trademarked hearing instrument fitting environment introduced by Audioscan in 1992 It presents hearing threshold UCL and amplified speech spectra as SPL in the ear canal The fitting goal is to make a
58. right hand speaker At periodic intervals the level of the speech and noise is momentarily reduced and an additional burst is played from either the left or right speaker to measure the response from that direction This burst is extremely fast and will not influence the behavior of the hearing aid The coupler SPL is analyzed into two curves labeled L left and R right to indicate which speaker generated the curve The real time nature of the test allows the operation of adaptive directional systems to be readily visualized Optionally speech can be disabled which will cause the directional test to alternate noise bursts from the left and right speakers This test may not produce a directional response in all hearing aids Once directional performance is observed the test may be terminated Because the Verifit test chamber is small and anechoic only at higher frequencies results are not expected to agree with data taken in large anechoic chambers It is a functional test only providing assurance that the directional microphone array has been correctly assembled and programmed and has not deteriorated due to element drift or the clogging of ports See also On Ear Instrument Measures 54 Verifit User s Guide Version 3 12 May 2015 Directional ITE positioning Attach the provided clip to the coupler for stability Orient the instrument as shown so that the direction of maximum sensitivity is toward one of the speakers and a line
59. rotating the monitor headset s volume control toward the front of the test box until the feedback bar shows red during parts of the speech passage Then press Continue 120 Verifit User s Guide Version 3 12 May 2015 Viewport Test box audioscan Test box feedback E Scale dB SPL Speech LTASS verge of feedback Test Stimulus Level aff Speech std 1 60 2 Speech std 1 60 Curve Hide Show Speech LTASS with feedback suppressed Gains DNIVURRBOIDCCIENCGNGERERIUENICOIAHDDSSBRERASDBSASORHIRAENSIDPERDORUISA UI 250 500 1000 2000 4000 8000 Power concentration e verge of feedback 1000 2000 4000 8000 Continue e Help e 4 When the test has finished peaks should be apparent in one or both curves 5 Without changing the setting of the monitor headset volume control enable the hearing instrument s feedback suppression and highlight and lt PICK gt Test 2 Allow the speech to run for a few seconds then press Continue 6 When the test has finished the peaks in the curves of Test 1 should not appear in the curves of Test 2 7 Press Continue to close Feedback and return to the Viewport screen Viewport On ear feedback test Refer to On Ear Measures Setup to prepare the system for use and for proper positioning of the client and the probe tube Insert the earmold tip or custom hearing instrument into the ear being careful not to advance the probe tube further into th
60. speaker response followed by the test number 1 4 To test directional function in situ see On Ear Instrument Measures Multicurve procedure Multicurve generates 1 to 4 output or gain response curves using either pink noise or swept pure tones at input levels ranging from 40 90 dB SPL and 0 dB off Press Tests then highlight and lt PICK gt Test box measures then highlight and lt PICK gt Multicurve Refer to Coupling the hearing instrument Positioning the hearing instrument and Battery pill use and care to prepare the instrument for testing Turn the instrument ON Highlight and lt PICK gt button 1 2 3 or 4 in the Test column Highlight and lt PICK gt the Stimulus window then highlight and lt PICK gt either Pink noise or Swept from the drop down list Highlight and lt PICK gt the Level window for the selected Test then highlight and lt PICK gt a stimulus level from the drop down list Press Continue to run a sweep or to capture a pink noise curve press Cancel to abort the test To measure another response curve highlight and lt PICK gt another test button to overwrite a curve highlight and lt PICK gt its test button To change scale from dB SPL to dB Gain highlight amp PICK the Scale window Multicurve results 1 Output curves for the noise signal are in 1 12th octave bands They will be approximately 18 dB lower than pure tone curves for a linear instrument
61. speech passage plays observe the feedback bar and the lower graph A yellow Feedback bar and peaks with yellow markers in the lower curve indicate incipient feedback which may impact sound quality A red Feedback bar and peaks with red markers in the lower curve indicate feedback that may be audible and should be mitigated Press Continue to run the full speech passage and capture average results for the passage 5 Repeat for Test 2 and 3 as needed These tests may be used to explore the effects of jaw movement and the presence of hands hats and telephone handsets On ear noise reduction test This test captures a response curve before the hearing instrument reacts to the presence of noise a comparison curve shows the hearing instrument reacting in real time The thick curve is the output before the noise reduction is activated and the thin line is the output as the noise reduction takes effect The test also provides an overall rms noise reduction value in dB 74 Verifit User s Guide Version 3 12 May 2015 Refer to On Ear Measures Setup to prepare the system for use and for proper positioning of the client and the probe tube 1 Qv Jo o uBe tet Press Tests then highlight and PICK On ear measures then highlight and pick Noise reduction Highlight and lt PICK gt Test 1 2 or 3 Highlight and lt PICK gt a stimulus type from the list box Highlight and lt PICK gt a stimulus level from the list box
62. test screens highlight and PICK Color to toggle between black and white In this screen you can also select the Mouse pointer speed button and select the response speed from the drop down list Press Continue to exit setup Saving test setup This feature lets you retain the last used stimulus type and level for most tests when the power is turned off and the last used target method and transducer type in Viewport Speechmap and Insertion Gain tests This feature also lets you determine how assessment parameters test levels and stimuli are treated when Session Erase data is selected To enable disable saving of test levels stimuli and assessment parameters 24 Verifit User s Guide Version 3 12 May 2015 1 Press Setup then highlight and lt PICK gt Save option 2 Highlight and PICK Save test setups on power off to toggle between Yes and No To enable disable erasing of test levels stimuli and assessment parameters when Erase data is selected 1 Press Setup then highlight and lt PICK gt Save option 2 Highlight and lt PICK gt Save test setups on erase data to toggle between Yes and No 25 Verifit User s Guide Version 3 12 May 2015 5 Networking Connection to a computer network allows screen images to be printed on a network printer or on a shared printer on a networked PC Images and underlying data may also be saved to a shared folder on a networked PC See Printi
63. test via the test chamber loudspeaker s the test chamber telephone mag netic field simulator TMFS the test chamber mag netic field test loop Verifit only or the sound field loudspeaker s Device output signals are measured in the 2 cm coupler via the coupler microphone or in a real ear via the probe microphone Data from the 2 cm coupler may be viewed as coupler SPL coupler gain or as estimated SPL in the ear canal simulated real ear measurements S REM Data from the probe microphone may be viewed as ear canal SPL as ear canal SPL re normal hearing threshold i e dB HL as insertion gain or as ear canal SPL in the context of an auditory area Speechmap 2 The test signals Sinusoidal pseudo random noise and digitized real speech signals are provided Two signals derived from real speech the International Speech Test Signal ISTS and the single talker International Collegium of Rehabilitative Audiology ICRA signal are also pro vided Test signals are generated in real time by the digital signal processor DSP or played from 16 bit binary audio files stored in the on board flash memo ry In the Verifit these audio files are up loaded from the internal compact disc CD drive at power up In order to provide a repeatable acoustic signal to the device under test a reference microphone is used in conjunction with a digital control loop to maintain the desired band level at each frequency Live audio speech music et
64. that should never be exceeded 5 Broadband output limiting targets are not provided DSL 5 0 changes The Audioscan version of DSL 5 0 includes provision for bone conduction and ABR threshold binaural targets targets for speech levels from 50 to 75 dB SPL new targets for children targets for adults and new RECD default values for children 1 month to 10 years and adults The UWO child s spectrum has been removed and an own voice spectrum has been added As a result of a re analysis of published data the vocal effort effects for Soft and Average speech levels have been made the same In addition the target symbol has been elongated to indicate that the fit to target is a range not a point The children s LTASSa targets for 70 dB speech are lower than those in previous versions of DSL These differences are functions of the hearing loss and age where average RECDs are used Revisions made in version 5 0a reduce these differences at 250 Hz and for more severe losses The differences will be more significant when the individual RECD values have not been measured for the child being fitted Audioscan assumes no responsibility for the validity of these changes that responsibility rests with the National Centre for Audiology NAL NL1 in Speechmap The NAL NLI procedure seeks to amplify speech such that all bands of speech are perceived with equal loudness while maximizing speech intelligibility and ensuring that the wearer perceives speech
65. the Swept stimulus at the same overall level 60 50 ee eae a et 250 500 1000 2000 4000 8000 The Average REUR used is shown above Measured REUR will vary from this For small children the peak may shift to the right and become sharper Drainage tubes and perforated ear drums will cause large differences usually around 1 kHz REAR measurement procedure 1 2 9 Press Tests then highlight and lt PICK gt On ear measures then highlight and lt PICK gt Insertion gain Referring to On Ear Measures Setup and On Ear Measures Screen Setup prepare the system position the patient and insert the probe tube For tight fitting hearing aids or earmolds the probe tube may be inserted through a vent Without disturbing the probe tube insert the hearing instrument or earmold Referring to Audiometric data entry enter threshold data Highlight and lt PICK gt button 1 2 or 3 in the REAR REIG column This will present a signal from the sound field speaker and display the REAR Setup box Highlight and lt PICK gt Stimulus then highlight and lt PICK gt Pink noise or Swept Use pink noise when using the NAL NL 1 fitting formula Use Swept when testing maximum output capabilities Highlight and lt PICK gt Level then highlight and lt PICK gt a stimulus level from the list box Use the level shown on the target REIG curves if present If no level is shown use the lowest level required to overcome bac
66. to be no louder than that which a normal hearing person would perceive Although NAL NLI states its goals for speech it derives insertion gain targets assuming noise as a verification signal Because it is more accurate to verify a non linear fitting using the signal for which the procedure was developed Audioscan converts the NAL NL insertion gain targets to LTASS targets for amplified speech in the Speechmap environment resulting in Speechmap NAL NL1 The conversions use the same adult average RECD and REUG as used in DSL The RESR targets are from Hearing Aids Dillon Thieme Publishing 2001 p274 An insertion gain version is available by selecting Insertion gain from the on ear measures test menu The pink noise stimulus should be used NAL NL2 in Speechmap Fitting targets default age related RECD and REUG are provided by a software library used under license from Hearworks Pty Ltd which is solely responsible for their derivation This revision of NAL NL1 has many more input parameters and output target formats than its predecessor In implementing NAL NL2 Audioscan has made the following simplifications and clarifications 1 NAL NL2 targets are provided as REAR targets in Speechmap Insertion Gain targets are not provided 2 There is no provision to select Insert earphones earmold as the audiometric transducer since this invalidates the audiometer calibration and correction for this error is problematic 3 Input output cu
67. tymonic Design Inc Audioscan 800 265 2093 MANAGEMENT OF ELECTRONIC PROTECTED HEALTH INFORMATION ePHI As defined by HIPAA Security Rule 45 CFR Part 164 Yes No N A Note 1 Can this device transmit or maintain electronic Protected Health Information ePHI 2 Types of ePHI data elements that can be maintained by the device a Demographic e g name address location unique identification number cccccceeseeseeeeesseteeeeessenseseeeeseenees b Medical record e g medical record account test or treatment date device identification number Cc Diagnostic therapeutic e g photo radiograph test results or physiologic data with identifying characteristics _ d Open unstructured text entered by device user operator eseeeeeeeeeene eene nennen nnne nennen nnne nnne nnn 3 Maintaining ePHI Can the device a b Store ePHI persistently on local media c Import export ePHI with other systems 4 Mechanisms used for the transmitting importing exporting of ePHI Can the device Display ePHI e g video display Generate hardcopy reports or images containing ePHI esses nennen nennen nennen nnn nnne nnn nnne _ Yes _ Retrieve ePHI from or record ePHI to removable media e g disk DVD CD ROM tape CF SD card memory stick _ Yes _ Transmit receive or import export ePHI via dedicated cable connection e g IEEE 1073 serial port USB FireWire _ No _ Transmit receive ePHI
68. 0 minus 17 dB the RTS is the full on setting of the gain control ANSI 83 22 Saturation in a hearing aid the limiting of output caused by the output circuitry and transducer reaching their maximum capability SPA Special Purpose Average the average of values in dB at three third octave frequencies separated by 2 3 of an octave ANSI S3 22 See also HFA Spectrum the BSPL as a function of frequency for a broad band signal SII Speech Intelligibility Index a quantity calculated from measures of speech noise and hearing threshold that is highly correlated with the intelligibility of speech ANSI 83 5 Speech Region a statistical range of short term spectra present in a speech passage The short term spectra are typically 120 130 millisecond averages in 1 3 octaves The statistical range is typically from the 70th to the 99th percentile SPL Sound Pressure Level rms sound pressure relative to 20 uPa expressed in decibels SPL 20log10 rms sound pressure 20uPa SPLITS coupler SPL for an inductive telephone simulator SPL developed in a 2cc coupler by a hearing aid with the gain control at the RTS when the input is the magnetic field generated by a TMFS ANSI 3 22 TMFS Telephone magnetic field simulator a device for producing a magnetic field of consistent level and geometric shape when driven by a specified current ANSI S3 22 THD Total Harmonic Distortion the power in all harmonic components as a percentage of t
69. 0 months or years from 6 years to 10 years For children older than 10 yrs previously fit using DSL choose Adult HL transducer Type of audiogram Select from Headphone Insert Foam or Soundfield In addition if Target DSL you may chose from Insert Mold ABR eHL ABR nHL If Insert Foam or Mold is selected the appropriate RECD will be used to convert entered HL values to SPL values If Soundfield is selected appropriate real ear unaided gain REUG values 45 degrees azimuth will be used to convert HL values to SPL values If ABR eHL is selected entered thresholds will be treated as behavioral pure tone thresholds If ABR nHL is selected nHL to eHL conversion factors may be selected from Default Enter In either case an insert earphone is assumed for sound delivery and the appropriate RECD will be applied Note that in some facilities nHL is defined in such a way that it is effectively eHL in these cases ABR eHL should be selected See ABR nHL to eHL setup and Assessment data choices 2 Bone conduction Select from N A Enter If Enter is selected an entry screen will be provided after the air conduction thresholds have been entered UCL Uncomfortable Level Select from Enter Average If measured UCL values are entered these values will be converted to real ear SPL and used as real ear saturation response RESR targets Note that DSL 5 0 has changed this term to Upper Limit of Comfort ULC Rega
70. 0601 1 this product is Class I with Type BF applied part This device complies with Part 15 of the FCC Rules Operation is subject to the following two conditions 1 this device may not cause harmful interference and 2 this device must accept any interference received including interference that may cause undesired operation This Class A digital apparatus complies with Canadian ICES 003 WARNING To avoid the risk of electric shock this product must be connected only to a supply mains with protective earth ground WARNING To avoid the risk of electrical shock any line powered peripheral equipment connected to this product must comply with UL IEC 60601 1 OR comply with UL or IEC and ISO safety standards for such equipment AND a be operated from an isolating transformer complying with UL IEC 60601 1 OR b be kept at least 6 feet 1 8 m from the patient WARNING This equipment is not suitable for use in an oxygen rich environment or in the presence of flammable anesthetic mixtures with air or with oxygen or nitrous oxide p pe qe EE WARNING No modification of this equipment is permitted Verifit User s Guide Version 3 12 May 2015 This symbol on the product is a WARNING that failure to follow instructions in this part of the User s and or Quick Start Guides could place the operator or patient at risk This symbol on the product means that the parts applied to the patient meet the safe
71. 1 1250 1600 2000 2500 3150 4000 5000 6300 Band Center Frequency Hz Figure 7 Analysis bandwidths of some real ear analyzers and critical bands for a normal ear If the analysis bandwidth is less than a critical band aided response curves shown to be at threshold or UCL will actually be well above it 7 3 1 Pink noise signal analysis All band levels are calculated with an averaging time of 128 ms For a linear hearing aid a pink noise stimulus will re sult in a response curve that has the same shape as one obtained using a swept pure tone However it must be remembered that while a swept tone has the same band SPL as overall SPL the band SPL for a noise signal is significantly lower than the overall SPL Consequently for a linear aid output curves obtained using 1 12 octave analysis will be about 18 dB lower than the output curves obtained using a swept tone at the same overall SPL As long as the hearing aid is linear the gain obtained will be the same for both sig nals Figure 8 shows output A and gain B for a lin ear hearing aid obtained using a swept tone 1 and pink noise 2 with a 60 dB overall SPL IMulticurva Dual view Ps n 120 f UN B ii ol OT T M 5n M m 1 Pi d 1 100 a on f TE an 2 M ba P i pl 1 P Md o uM 7 ra M i L 1 fa 1 L East S00 TOo00 2000 AD BO eo S00 Dual view Q Test Stimubus Level Dualwiew Graph ojl UO Swept eo Graph 50 Se
72. 1000 1250 1600 2000 2500 3150 4000 5000 6300 8000 BAND CENTER FREQUENCY Hz Figure 15 Dynamic range of Verifit speech signals at average vocal effort 09 01 29 Etymonic Design Incorporated 20 Ludwig St Dorchester ON Canada NOL 1G4 USA 800 265 2093 519 268 3313 FAX 519 268 3256 www audioscan com 12
73. 2 2003 facts To select the standard to be used 1 Press Setup then highlight and lt PICK gt ANSI 2 Highlight and lt PICK gt the version of the ANSI standard you wish to use 39 Verifit User s Guide Version 3 12 May 2015 3 Press Continue to exit ANSI test frequencies The Frequencies feature allows hearing instruments to be evaluated at the Special Purpose Average SPA frequencies defined by ANSI 3 22 rather than the default High Frequency Average HFA frequencies The choice of SPA or HFA frequencies influences the average OSPL90 average full on gain reference test gain bandwidth and equivalent input noise The frequencies at which distortion is measured are one half the selected SPA frequencies You can also select the frequencies at which attack and release times are measured To change the averaging frequencies 1 Press Setup then highlight and lt PICK gt ANSI 2 Highlight and lt PICK gt the HFA SPA button to generate a drop down list box of alternate test frequencies 3 Highlight the desired HFA SPA test frequencies and press lt PICK gt to select To change the frequencies for attack and release time measurements In the list of available frequencies highlight and PICK the frequencies to be used to measure attack and release time Press Continue to exit Test box calibration facts Test box microphone calibration establishes a correction curve for the uncalibrated test
74. 6 RECD measurement The RECD real ear to coupler difference may be individually measured to improve the accuracy of hearing aid fittings The measurement procedure may be accessed by selecting RECD from the On ear tests list or from the Audiometry poster within Speechmap Calibration of RECD transducer RECD values are stored and expressed as referenced to the HA 1 ITE coupler however for ease of measurement we calibrate the RECD transducer in the HA 2 BTE coupler 1 Connect the RECD transducer to the RECD jack on the front of the test chamber Prepare the system for test box tests See Microphone connection Calibrating test box reference microphone Prepare the system for test box tests See Microphone connection Calibrating test box reference microphone 2 Press Tests then highlight and lt PICK gt On ear measures then highlight and lt PICK gt RECD 3 When prompted select the coupling foam tip or mold that will be used for the on ear RECD measurement 4 If a valid RECD transducer calibration exists go to RECD on ear response 5 If no calibration exists or the measurement interval has been exceeded connect the BTE coupler to the coupler microphone and connect the RECD transducer to the BTE coupler 6 Highlight and PICK Calibrate RECD transducer and follow the setup instructions 7 Press Continue to generate the coupler response curve green When this curve is stable press Continue to save i
75. Audioscan Verifit User s Guide 3 12 May 2015 C 0086 Table of Contents Jan Veste Ut eL eum tte E E 6 New an tis software relgase oninia pes e pni peo eee ie peas Debe d opua dates o dae o fex repe eee 6 Product CES ule e 6 ASSOCIALE items ANG SUPPIIES T deasaotebs 7 SAFETY WARNINGS and NOTICES 2 ttc hrec rtt e Lettere Fr eB beside mene 7 Exaronmeptal SAUeUy iioc sade ca cct ed trei oerte d eee tete ene reete Dep dre e fe eet dee dentata berti pr ete ceo teen Peer 8 Declaration of Electromagnetic Compatibility EMC 2 eire re reote tt rt e SER e CEPR CH LEE Te eh epos 8 Warranty Trademarks Acknowledgments idest E EEEE E Eo TURF e EB FEL E EREE ee eade ea Ra 9 EC Declaration of CODFOPIILy 1 eres rete eret tare entente cane RENE Feed ree es EE ego regen aep sedan E es eere vedere uda c 11 Electronice User ACID RR PESE 12 How to Avoid Undesirable Side Effecls 2 GI ERREUR HERI HR HIM ER anaes ecageidecs 12 PAG DAP E E 14 Unpacking and OMS UNA cc ose edit UTE ER BI E AEST EE AA EE EUER sites re Hte TAA PEE E eO EE eE GRS 14 Microphone ODDOell0p oet e roter e ee EP A Itane Hee IDE Tog Eee de re A EE E 15 General care TRstr CcblOns 6 estet e e Pen p E GEE I eee ei Rep devas epe dete Fede E e UA EP Etna 16 Microphone Cate T 16 Ba
76. C D B Whitred L4 P a 0086 Regulatory Affairs Manager Quality System Management Representative 20 Ludwig Street Dorchester Ontario NOL 1G4 www audioscan com Tel 519 268 3313 Fax 519 268 3256 USA 1 800 265 2093 11 Verifit User s Guide Version 3 12 May 2015 Electronic User s Guide You can download the current User s Guide directly from www audioscan com A printable User s Guide is also provided with each new instrument and each software update A pdf file viewer such as Acrobat Reader 5 0 or higher or Foxit Reader is required to view the User s Guide Except for some additional reference material the information in the User s Guide is available to you at any time by pressing Help on the Verifit If your Verifit does not have a built in CD drive serial number 4671 and higher a printable User s Guide is on the updater USB flash drive supplied with the instrument This User s Guide will be updated each time you download new software from www audioscan com to the updater USB flash drive To view the User s Guide 1 Insert the updater USB flash drive into a USB port on your PC 2 If your PC does not open the flash drive automatically select My Computer then the Removable Disk drive usually E or F 3 Double click the User Guide folder to open it 4 Double click the english folder and copy the Verifit Users Guide pdf file to an appropriate location on your PC Double click on the file to open it
77. GEE HESSE EL ional AEAEE 67 Positiomnps the client xu sheep utes e HP td e eie d pH IDE RU 67 POSING the probe MUG RM NR 68 1S Qn Ear Measures Screen SSCP iss cs LEER nns 70 Orn ear Single Or inal View i sce adcelasecenddedscycducedvaavectoiseidsa dane EUER Tp ERE EU PASE e Ee EE ER UR saceussevageasseseassneareuazsate 70 Graphs table or 26e target formaties er niter erret anes aes iet e tie Ep NEUE e eive e bec reste rere e WR Eee Pee dn 71 SPL Of HL Silena aa 71 Fide ar show on ear CURVES soreer enie in A A E EE E RE E E O EAAS 71 14 One Bar strument Medsin ES sie eorr teer ert te PRETIO tren duce Pe hee pee Ee Ue EUR aet ever bee pue AESA T3 On ear directional tesUDVervIg Wis 3 RUE ERG E E E RR b E ee ER HAE UE 73 Ecc npo curiis 13 Verifit User s Guide Version 3 12 May 2015 15 16 17 18 19 20 On ear Teed back f68 5 seii Ro ERE EEG ERO RR RE THER HR ERE ORO HH OU 74 Orn ear MOISE reduction Test oe DE LM EEE Len uino Ee Sepe epe RAE Le E UTEE EEE sa aseo Yee dae E iE 74 Oneear manual Control e IS Sound level meter using on ear maucropbOnes e aee eerte rette n stet Hi E EENE TESKE EESE a NANE Nea 76 Occlusion Bifect T Bsb s ecocoie meet P rre RERO ODIO Ir EP CHUTE Des EE Ee aT R ESENS 78 Occlusion efte ct Mm asuremMet SR 78 RECD mea
78. Gain curves for a linear instrument will be the same for both swept and pink noise test signals For compression instruments both gain and output curves may be expected to differ for the two test signals See Test Box Measures Setup to change screen appearance 57 Verifit User s Guide Version 3 12 May 2015 Multicurve audioscain 100 90 80 70 60 50 30 A Presentation Single view LI Scale dBSPL Format Graph Lil Test Stimulus Level 1 Pink noise 60 2 Swept 60 3 aj Curve Hide Show a ul ee Se Lae eel rl 250 500 1000 2000 4000 8000 Spectral analysis in Multicurve Selecting a stimulus level of 0 dB off in Multicurve presents a spectral analysis of the coupler microphone signal Scale dB SPL or the difference between the coupler and reference microphone spectra Scale dB Gain If the stimulus type is Pink noise the analysis is performed in 1 12th octave bands and displayed in real time Pressing Continue captures the displayed spectrum If the stimulus type is Swept a swept filter analysis is performed in 1 12th octave bands and displayed at 1 3rd octave frequencies Pressing Continue causes the swept filter analysis to be performed in 1 12th octave bands and displayed at 1 12th octave frequencies Battery drain test The battery drain test automatically measures the battery current when there is no input signal quiescent whe
79. H Gravel J S amp Tharpe A M eds Amplification for Children with Auditory Deficits Nashville Bill Wilkerson Center Press 161 191 Seewald R C amp Ross M 1988 Amplification for young hearing impaired children In M C Pollack Ed Amplification for the Hearing Impaired Third Edition pp 213 271 Orlando Grune amp Stratton Seewald R C Ross M amp Spiro M K 1985 Selecting amplification characteristics for young hearing impaired children Ear and Hearing 6 1 48 53 Seewald R C Ross M amp Stelmachowicz P G 1987 Selecting and verifying hearing aid performance 138 Verifit User s Guide Version 3 12 May 2015 characteristics for young children Journal of the Academy of Rehabilitative Audiology 20 25 38 Seewald R Moodie S T Scollie S amp Bagatto M 2005 The DSL method for pediatric hearing instrument fitting Historical perspective and current issues Trends in Amplification 9 4 145 157 Seewald R C amp Moodie K S 1992 Electroacoustic considerations In M Ross ed FM Auditory Training Systems Characteristics Selection amp Use Timonium MD York Press Sherbecoe R L amp Studebaker G A 2003 Audibility Index predictions of normal hearing and hearing impaired listeners performance on the Connected Speech Test Ear and Hearing 24 1 71 88 Sinclair S T Moodie K S amp Seewald R C 1997 Pediatric Hearing Instrument Fitting Ph
80. Highlight and lt PICK gt Start test Highlight and lt PICK gt Continue to capture the comparison curve once the noise reduction function has responded On ear manual control 1 2 Refer to On Ear Measures Setup to prepare the system for use and for proper positioning of the client and the probe tube Press Tests then highlight and lt PICK gt On ear measures then highlight and lt PICK gt Manual control 75 Verifit User s Guide Version 3 12 May 2015 Max TM SPL 120 amp Level 75 dB Frequency 1680 Hz Distortion 6 5 96 raha ue due sue um al aan Sa 0 10 20 30 40 50 60 70 80 30 100 Probe microphone 113 0 dB FSS SSS SELES L SS VL LIS RSLS SLICE ne ES aS 0 10 20 30 40 50 60 70 80 80 100110120 130 Reference microphone 75 0 dB Pome ee a ea TEUER ERU 0 10 20 30 40 50 60 70 80 90 100110120150 Gain 38 0 dB Sh A 0 10 20 30 40 50 60 70 80 90 100 3 Highlight and lt PICK gt the Level window then highlight and lt PICK gt the desired stimulus level from the drop down list 4 Highlight and lt PICK gt the Frequency window then highlight and lt PICK gt the desired frequency from the drop down list Distortion measurement data is available only from 200 2500 Hz 5 Highlight and lt PICK gt Start test to start the test Start test changes to Stop Test To stop the measurement highlight and lt PICK gt Stop test You may change Level and Freq
81. Hz E 1 Average OSPLSO 120 dB 100 to Average gain 50dB 49 dB Gain control at RTS Response curve 60dB 4 2 Average gain pede 43 dB Frequency range 200 5600 Hz Battery drain 1 29 mA Equivalent Input noise 23 dB 500 Hz distortion 70dB 2 800 Hz distortion 70dB 1 Yo 1600 Hz distortion 65dB 0 HFA SPA Frequency Attack Release Averaging Frequencies i 250Hz 5 0O ms S00Hz 130 110 5 1 1000Hz 0 2000Hz 0 380 ms 1 4000Hz 0 210 ms 50 bc 250 500 1000 2000 4000 8000 HFAISPA 1000 1600 2500 Hz ANSI input output curves An input output curve shows the output level of a hearing instrument as a function of input level and frequency It is a steady state pure tone curve and does not reflect performance with complex signals such as speech You may run the tests at any setting of the instrument controls but ANSI S3 22 requires that certain settings be 47 Verifit User s Guide Version 3 12 May 2015 used See ANSI S3 22 1996 facts and ANSI 83 22 2003 facts The Input Output test allows you to generate up to 4 separate input output curves at each of 5 individual frequencies 250 500 1000 2000 4000 Hz as provided in ANSI 83 22 1 Press Tests then highlight and lt PICK gt Test box measures then highlight and lt PICK gt Input Output 2 Refer to Coupling the hearing instrument Positioning the hearing instrument and Batter
82. L 82 Verifit User s Guide Version 3 12 May 2015 thresholds measured with insert phones For threshold corrections in the HL to SPL transform the Verifit uses an HA 1 RECD or an HA 2 RECD including tubing effects based on whether the stated HL transducer is Insert foam or Insert mold respectively If the RECD was measured with an earmold these tubing effects will be specific to the client s earmold if it is measured with a foam tip they will be based on average earmold tubing For Test box Speechmap involving BTE instruments the earmold tubing must be considered If the BTE is coupled to the HA 1 coupler using the personal earmold the tubing effects will be part of the measurement If the HA 2 BTE coupler is used the HA 1 referenced RECD will be converted to an HA 2 RECD As with the threshold correction above the use of the earmold in RECD will include the effects specific to the client s earmold otherwise an average earmold is assumed The following describes acceptable RECD measurement protocols and Test box Speechmap coupling combinations for BTE instruments and the implications of each in the test box simulation ANSI 3 46 method RECD On ear measurement Audioscan RECD transducer foam eartip Test box Speechmap coupling client s personal earmold HA 1 ITE coupler With this method RECD is a property of the ear only and not dependent on the transducer or sound source coupling The earmold effects will be part of
83. NST S3 22 2003 fACE EE 45 ANSI 1990 Lincar and AGC 8Sts eiie osae ptt rere terrae EROE E E A AEE ER ERE Hed Ud 46 ANSI 2003 Linear atd AGC Eests te inosia eerte eer errant rer Pee HR Cep cete Lee bee ra eiie cod et etae dua 46 AINSI WESE results aiio mene er rep HR IEEE IP op rep Ie ED Dep Tope p Gies 47 ANSI Wp OU tp Ul CULV ES P 47 PINS Iitelee wall Terminol By RH 48 ANS telephone simulator PMES J t68L eerie tice ore erepto ana Feed ipee oe eher espere sees soeesdeaeisausedessivtardatacinvaneesnnase 49 AINSI hes IOP WES bees T M 50 WEL SC Gill test PES UNS ci os ccs iae eena EEn E SEE TENE NEEESE A TEREE E EE EE E TEE E AEE ES 50 10 Other Test o disc P e E NEREA R ETN E ENR ENEE 52 Harmonie MiSstoriON screnu anaa R EE E E E A ES E ERSE EE E aA 52 IN ISE PEDUEIION MH enere PE EEES NEN OE EASA EEEE E EEE E AAEE AREER n EE ni 52 Feedback Suppression test MM 53 Directional function Test coe eo te bee aan ieee D oo cat tsp E ea othe hues lets cel ge ER OEC LRL theca cade ss 54 Pines choral ITE POS uremia P 25 Direchional BTE POS OMe CR H 55 Test Box directional procedure i t ete tee te t eto edet etre enr inbess coasass pe E EEES E EEE Condes o PR EE RE TEE ERE EYE 56 Mu lticuryve pro edure C
84. RR ER exe een Ee eden Leno edet ean PRU ERREUR 92 NAL NL2 qo re TID E E M 92 Camhit in js psechmdp iiri eee eee ete eret ese Peter ee hr eoe erbe eee vire Ee eese edet eo cdvebes E a chad svtddasdavecedvashevisee s 93 Usine S PES CMI A 5 93 DPSCCHMAP SEU Precisssces sis sdsleecessiiidsccsalacidiececad hes seaedaceasacsacncsusuessdeaseccsiecusadsaceagssesgadeadoesassausaseduceuawinasealesedsgcastaceansadoaneoeatan 94 Screen tour unaided SCreen oec s caeteri Storie er Ee rU Pe PERI E k atas cede edl cpdeaszucbs EAEN R AE ATA SEERA 95 Screen TOUT AIMED SCHOEN E 96 Onseart or Test DOK MOU e 96 SIEcalculation in Speechimap e rto eee irte teen eet eee REDE LE e ER EU ver e e eases Na ves pedet vespa ne 97 Using enistom Stimuli m I n IULII RT HHR 97 Creaung WAY Biles for Speeelimilap eoe eee ette eere sette eoe ip heo ie ree rev iret ie Fes pert eee tel pti e pne pee bee Een e ERE REPERI 99 Speechmap Fittnes Procedure Ssss siers an n an aE te t ore tipa repe e ero Pod Re Recon Eo dene E 101 Assessment data Enty 5 eter REI EHE E PR ERE REN EA ERSTE e Re bende te SE Eee E e ERE e ER e HER e SERT PER UR OR co sacncesacsdosens 101 Assessment data CHOLES siccis srie E bere ce ere lesa aa tede eve onere ud oes naeh deb ed
85. SPL for 90 dB input SPL The SPL developed in a 2cc coupler when the input SPL is 90 dB with the gain control of the hearing aid full on ANSI 3 22 Oscillation in audiology refers to the undesired tonal output of an amplifier behaving unstably as a result of feedback whistling 1 Output Compression a form of AGC in which the signal level is regulated at the output OLC Output limiting Compression compression limiting a form of AGC with a high kneepoint and high compression ratio PC Peak clipping a method of limiting MPO by truncating the electrical signal supplied to the output transducer The resulting acoustic signal may not be truncated but will be distorted PCR Power Concentration Ratio a measure of the degree to which a large amount of power is concentrated at a small number of frequencies in the output of a hearing aid Probe microphone microphone which may include an extension tube having a sound inlet which is small enough to be acoustically unobtrusive when inserted into the ear canal ANSI S3 46 Pure tone a signal containing one and only one frequency a sinusoidal acoustic signal 1 REAG Real Ear Aided Gain difference in dB as a function of frequency between the SPL or BSPL at a specified measurement point in the ear canal and the SPL or BSPL at the field reference point for a specified sound field with the hearing aid in place and turned on ANSI 83 46 REAR Real ear Aided Response the SPL o
86. Speech5000 Og Speech6300 MIL ICRA noise LI LJ Pink noise rm select at least one of the defined LTASS speech stimuli 1 To select a stimulus highlight and lt PICK gt the stimulus you want to add to the list A check mark will be placed next to the selected stimulus 94 Verifit User s Guide Version 3 12 May 2015 2 To remove a checked stimulus from the list highlight and lt PICK gt the stimulus you want to remove You can also choose to have the envelopes of the speech test results automatically hidden leaving only the LTASS when you start another test Highlight and lt PICK gt the Hide speech envelopes button to toggle between automatically and manually When you have finished making your selections press Continue to exit Setup Screen tour unaided screen Speechmap audioscan 140 Max TM SPL 120 ry Instrument BTE dw la Change this in Setup l E Mode Omear Format Graph 120 __ __ Estimated UCL x x Sede dB SPL 110 Ng x Audiometry EM x Age Adult 904 LTASS Long term average Impaired threshold Transducer Headphone 12 dB speech spectrum UCL Average 80 LTASS RECD Average 70 4 BCT NIA 60 Binaural No REDD Average 50 40 30 LTASS ad Test Stimulus Level SII 18 dB Af 20 a d l 2 10 CMT TER Pic 3
87. User s Guide Version 3 12 May 2015 sufficiently to raise them above threshold In this case the high frequency components may be shifted to a lower frequency with a better hearing threshold where the available gain will render them audible Four modified versions of the Speech std 1 test stimulus Speech3150 Speech4000 Speech 5000 and Speech6300 are provided in Speechmap to assist in verifying and adjusting frequency lowering devices In each of these modified test stimuli the 1 3 octave band levels above 1000Hz are reduced by 30dB except for an isolated 1 3 octave band centered at the frequency indicated in the selected test stimulus name With these reduced band levels the resulting LTASS produces a distinct cavity between 1000Hz and the selected high frequency band as seen below for the FM Boom test signal For clarity the Speech3150 curve is not shown 100 LTASS Speech std 1 90 80 70 60 LTASS Speech4000 40 LTASS Speech5000 3 LTASS Speech6300 7 20 esed ra 10 lu ms B al ae c rc lc E s c icc 250 500 1000 2000 4000 8000 To test frequency lowering 1 From the Speechmap screen choose either On ear or Test box Mode Review 17 9 On ear or Test box mode 2 Program the hearing instrument so that the frequency lowering feature is inactive 3 Select Test 1 and choose 65dB from the level menu 4 Choose Speech3150 Speech4000 Speech5000 or Speech6300 from the stimulus
88. a DSL was developed by the National Centre for Audiology NCA London Ontario Audioscan has implemented DSL within its Speechmap fitting system since 1994 In 2005 DSL underwent an extensive revision resulting in DSL 5 0 It was further revised in 2007 to version 5 0a See DSL 5 0 changes for details of the changes The Audioscan version of DSL 5 0 may differ from others in the following ways 1 DSL 5 0 uses RECD values for ages gt 119 months from a different source than for ages up to and including 119 months Audioscan has used the RECD values for a 119 month old for ages gt 119 months so all values come from the same study 2 Input output curve targets and compression threshold targets are not provided Such steady state parameters are of little value in estimating amplified speech levels Matching amplified speech to the LTASS targets at levels from 50 to 75 dB SPL provides much better assurance that fitting goals are being met 91 Verifit User s Guide Version 3 12 May 2015 3 There is no provision to input the number of compression channels This may be useful when the signal used for verification is not the signal for which the targets were developed It is irrelevant when using real speech signals to match speech targets and when using narrow band signals to match narrow band maximum output targets 4 The term Uncomfortable Level UCL is used rather than Upper Limit of Comfort ULC in referring to the ear canal SPL
89. a graph will display a screen cursor with a digital readout of X and Y co ordinates Clicking again will dismiss the cursor Note that mouse speed can be changed by selecting Setup and Display Function Keypad QWERTY Mouse Summon Help menu Help Fi Right click Summon Setup menu Setup F2 Right click Summon Test menu Tests F3 Right click Summon Session menu Session F4 Right click Switch between Ears or lt Left Right gt F5 Left click or Right click A B Data or Help index and Help page for keypad image Print Print Print Scrn Right click Move across screen columns amp ip 4 p Move mouse Arrows Arrows Move within a screen column Arrows Arrows Move mouse Select a highlighted item or operate a Round key lt PICK gt Numeric Left click screen button key Enter Key Enter numeric data Select point on chart Numeric Left click on a point on keypad chart Enter text Not possible Any key Not possible Proceed from current state lt Continue gt Enter Click Continue Revert to previous state lt Cancel gt Esc Click Cancel Barcode data input In Speechmap Viewport and Insertion gain tests audiometric data in barcode form on an Audioscan analyzer printout may be entered by scanning the appropriate barcode In Speechmap air and bone threshold UCL RECD audiometric transducer age and ABR nHL to eHL conversion factors are encoded In Insertion gain threshold and audiometric transducer type are encoded The
90. acking the Verifit and connecting various components and associated items Unpacking and connecting Push down and turn 1 Carefully unpack the two parts of the Verifit and check the contents of the shipping box against the enclosed packing list Note that some parts may be packed inside the test chamber 2 Connect the two 15 pin cables from the connectors on the rear of the test chamber to the connectors on the front of the main display unit as shown The top side of each connector is labeled to assist you Take care not to force the connectors as the pins are easily bent Both short as shown and long cables are provided for flexibility in locating the two parts of the instrument NU d B audio Main Display A Test Chamber EA a 3 Connect the power cord to the socket next to the power switch on the left side of the main display unit Plug the other end into a grounded 100 240 volt power outlet 14 Verifit User s Guide Version 3 12 May 2015 Microphone connection REFERENCE COUPLER BATTERY MIC MIC PILL 1 Plug the reference microphone and the coupler microphone into the connectors in the test chamber as shown 2 Plug the probe microphone assemblies into the probe connectors located at the front edge of the built in keypad as shown Left Ear Right Ear NOTE A microphone extension cable VA 131 VA133 is available from Audioscan Standard audio extension
91. ae p eem o voee puse n agaae es ma Tad 114 Verifit User s Guide Version 3 12 May 2015 Speech sienal analysi8 35e ndi deo rie o er rd te Ier UU PR LED E E E AEN 114 21 AI p M E 115 bi ep 115 ACCESSING SI SIE T 116 View port Auslibility test 5 hoe ort rettet er top di ror Io e Pe lo re o Dole iore de roa 116 View port Test box directional test eei eere tette ette R Erro O ERU E VERRE pu UB ERR Eee ep tv Doe PUR ERES aed 117 Wie qnos dicio d n 120 Vie wport Om car feedbacks 681 o een dee IO eee sete o Pr Urea Obr pe fut rt tete tese Rao eden 121 22 THOU bles WO SI TETREETET T iah 123 DEE CESE PAMUMES R 123 Wate OPUS HON PX 123 Test box High distortion Of DOISe or tete tine eter repre ted i te t e Eee D a e AEE Ei Sai 124 Test box Curves INCONSISTENT sisi eei ntt o a eee np perire LO To C RH E EG Revier bo ERE ERROR E e 124 Test box curves differ froni specifications ci Io Re rete toner ER ERE ERE Moab uen tne R EE ceputenn bee 124 Testibox Speaker OVeFEIYBRB vertere cout ere den reed et oer rond ia edere ie eei rer Yer ite sete oe eere E iresex EA ENEE 125 No test box reference mic detected eie deett ertet
92. al of an earmold It is not related to the required gain of a hearing aid REUG Real Ear Unaided Gain difference in dB as a function of frequency between the SPL or BSPL at a specified measurement point in the ear canal and the SPL or BSPL at a field reference point for a specified sound field with the ear unoccluded ANSI 3 46 REUR Real ear Unaided Response SPL or BSPL as a function of frequency at a specified measurement point in the ear canal for a specified sound field with the ear canal unoccluded ANSI 83 46 Reference microphone microphone used to measure the stimulus level in the measurement process or to control it in the equalization process Release Time the time required for HA output to fall to within 4dB of its steady state level for an input step from 90 to 55dB SPL ANSI 83 22 REM Real ear Measurement RTG Reference Test Gain the HFA gain for a 60 dB input SPL with the gain control at RTS ANSI 3 22 Reference Sound field the calibration point of a sound field measurement RSETS Relative Simulated Equivalent Telephone Sensitivity difference in dB between the HFA SPLITS SPA SPLITS and the RTG plus 60 in the M microphone mode RSETS HFA SPLITS RTG 60 RTS Reference Test Setting of the gain control for a 60 dB input SPL the setting of the gain control required to produce an HFA gain within 1 5 dB of the HFA OSPL90 minus 17 dB If the full on HFA gain is less than the HFA OSPL9
93. ale dB SPL O ZLO Pinknolse Seale dE Gain 2j 3 Swept B 4 9 Curve Hides Show Cu 20 requirement and for this reason all Soeechmap pas sages are at least 10 seconds long The LTASS curves displayed in Speechmap are 1 3 octave band levels at 1 12 octave intervals It should be noted that this results in smoothing and the apparent broadening of the spectrum of a narrow band signal For example a 1 3 octave band of speech will exhibit a spectrum 2 3 octave wide The dynamic nature of speech is often characterized by the distribution of short term levels in each 1 3 octave band Historically time periods of 120 125 or 128 ms have been used In Speechmap 1 3 octave band levels at 1 12 octave intervals are derived ev ery 128 ms The level in each band that is exceeded by 1 of the samples called L1 or 99th percentile has historically been referred to as the speech peak for that band The curve for these L1 levels is approxi mately 12 dB above the audioscsry LTASS The level in each rr band that is exceeded d by 70 of the samples Fa called L70 or 30th per centile has historically l been called the valley i of speech for that band Yq The curve for these L70 levels is approximately 18 dB below the LTASS t The region between i these two curves is of Too OO OD ono ten called the speech re gion speech envelope or speech banana The speech envelope when derived in this way has s
94. alue of this curve the frequency of the peak the HFA or SPA full on gain are determined at full on gain setting The response curve frequency range Reference Test Gain battery drain equivalent input noise distortion attack and release times are determined at RTS These changes result in more consistent values for reference test gain equivalent input noise and attack and release time See 1996 or 2003 ANSI standard 8 2 ANSI S3 22 1996 facts and 8 5 ANSI 2003 Linear and AGC tests ANSI 1996 Linear and AGC tests 1 Press lt Tests gt then highlight and lt PICK gt Test box measures then highlight and lt PICK gt Linear or AGC Highlight and lt PICK gt Start test and follow the test setup instructions which are presented Refer to Test Box Measures Setup Coupling the hearing instrument Positioning the hearing instrument and Battery pill use and care to prepare the instrument for testing Turn the instrument ON Set the gain control manual or programmable to maximum with all other controls set to provide the widest frequency response greatest gain and highest maximum output AGC controls and or programmable parameters should be set as designated by the manufacturer Press lt Continue gt to run the test or lt Cancel gt to abort the test Note that if required the Verifit will pause during the test to request that the volume control be adjusted to the Reference Test Position RTP Open the test box if
95. and lt PICK gt Test 1 2 3 or 4 This presents test signals from both speakers Two real time curves appear on the screen the heavier one is the response to the left speaker signal and the lighter one the response to the right speaker signal For a non directional instrument the two curves will be nearly identical Setting the instrument for directional operation should produce a separation of the curves On the Test control poster highlight and lt PICK gt the Level window then highlight and lt PICK gt a level from the drop down list For an adaptive directional instrument a stimulus level between 60 and 70 dB should cause the separation to change over a 15 45 second period For a noise reducing instrument both curves may change with time and stimulus SPL Highlight and PICK Speech S N within the Test control poster and select a signal to noise ratio from the list box defaults to 0 dB A S N ratio between 0 and 6 dB will usually induce directional performance after 15 45 seconds Optionally highlight and lt PICK gt Speech S N and select Off This presents noise alternating between the left and right test speakers Speech adaptive directional instruments may appear to be non directional if Speech S N is set to Off 56 Verifit User s Guide Version 3 12 May 2015 7 Press Continue to capture curves or press Cancel to abort the test Captured curves are labeled L left speaker response and R right
96. and REIG data associated with the current test ear REUR should be measured only if Transducer Soundfield Otherwise it is more accurate to use average See Audiometric data entry 1 Press lt Tests gt then highlight and lt PICK gt On ear measures then highlight and lt PICK gt Insertion gain 2 Referring to On Ear Measures Setup and On Ear Measures Screen Setup prepare the system position the patient and insert the probe tube 3 If REUR is set to Average highlight and lt PICK gt Audiometry then highlight and lt PICK gt REUR to toggle to Measure Press lt Continue gt to advance to the Threshold entry poster You may enter threshold data at this time see Audiometric data entry or press lt Continue gt to proceed with the measurement 87 Verifit User s Guide Version 3 12 May 2015 4 5 Highlight and lt PICK gt REUR below REAR REIG test 3 Press Continue to accept the default 55 dB SPL Pink noise stimulus and capture the REUR curve OR highlight and lt PICK gt Stimulus and Level to select other values These choices have no impact on the resulting REIG If there is a notch in the 4000 to 8000 Hz region try advancing the probe tube 2 mm and repeating step 3 If the notch moves to a higher frequency repeat this step until the notch moves beyond the highest frequency of interest Because it is analyzed in 1 3 octave bands the Noise stimulus produces a REUR 12 dB below that produced by
97. are versions 3 10 39 and earlier will be HA 2 referenced and will be converted to HA 1 referenced data for use storage and display Subsequent printing saving or export will show the converted HA 1 referenced values only If you use insert ear phones for audiometry OR if you verify using the test box you should measure RECD preferred or use age related average RECD 84 Verifit User s Guide Version 3 12 May 2015 17 Insertion Gain Insertion gain is the difference between aided and unaided ear canal SPL REIG REAG REUG It inherently assumes a sound field audiogram For non linear hearing aids REIG is stimulus dependent and the dependency is specific to each hearing aid Insertion gain fitting methods ignore these facts Viewport or Speechmap is recommended for fitting all linear and non linear hearing instruments Refer to On Ear Measures Setup and On Ear Measures Screen Setup for terminology and information on preparing the system for use and for proper positioning of the client and the probe tube Insertion gain in SPL Insertion gain audioscan 1404 MaxTM SPL 120 amp Instrument BTE Y 130 Presentation Single view Format Graph Y 129 Scale dB SPL J 110 100 Speech Audiometry Intelligibility Transducer Headphone 90 Index SII REUR Average 80 REAR 70 REIG Stimulus Level SII 60 1 Pinknoise 55 76 2 50 3 40 Fitting mein REUR Pink noise 55 38 30 REIG 1 NALRP wj
98. attery drain and Manual control screens you have the option of selecting either a graphic or tabular format To change the data format highlight then lt PICK gt Graph or Table Scale On the Multicurve test screen you have the option of displaying test results in SPL dB or gain dB To change the scale highlight then lt PICK gt dB SPL or dB Gain Hide or Show test box curves To hide or show test curve s 1 Highlight then lt PICK gt Curve Hide Show Curve display Curve display m7 Instrument B Testi Show Show Test 1 Show LJ Test2 Hide 5 Hide Jf Test r Test 3 Hide 3 Hide L3 ees Hide 1 Unaided 65 Hide 2 Highlight then lt PICK gt the desired test to toggle between the Hide or Show options The curve will toggle on or off when selected The envelope of speech curves in Speechmap may be displayed or hidden for clarity of display by toggling the buttons under the mi column Note that you may set the envelope to automatically hide whenever a new test is run 1 see Speechmap Speechmap Setup 3 Press Continue to return to the test screen Hiding a curve does not erase it To erase curves use the Session key 1996 or 2003 ANSI standard Automated tests of linear and AGC hearing aids may be conducted according to either the ANSI S 3 22 1996 or ANSI 83 22 2003 test standards For differences see ANSI S3 22 1996 facts and ANSI S3 2
99. aves in a sound field in which the frequency of a test tone carrier is varied by a low frequency triangle or sine wave FM System an assistive listening device consisting of a microphone an fm radio transmitter and an fm receiver The microphone and transmitter are worn by the speaker and the receiver is worn by the listener 132 Verifit User s Guide Version 3 12 May 2015 FOG full on gain gain for a 50 dB input SPL with the gain control set to maximum ANSI 3 22 Gain in dB output sound pressure relative to input sound pressure expressed in decibels gain 20log10 output sound pressure input sound pressure also gain output SPL input SPL Gain control a manually or electronically operated control for the adjustment of overall gain ANSI 3 22 HA 1 Coupler a coupler having a volume of 2 cubic centimetres with direct access to the cavity Used for testing in the ear and in the canal hearing aids can also be used to test behind the ear hearing aids with a custom earmold attached Aka the ITE coupler HA 2 Coupler a coupler having a volume of 2 cubic centimetres with access through a rigid tube When used for testing BTE hearing aids the rigid tube consists of 18 mm of 3 mm tubing plus 25 mm of 2 mm tubing ANSI 83 22 When used for calibrating insert earphones the 2 mm tubing is not used ANSI 583 6 Aka the BTE coupler Harmonic a component of a tone complex that is an integer multiple of the lowest fr
100. box reference microphone by comparison with the factory calibrated coupler microphone It may be performed as often as desired but will be invalidated at 12 am the following day or at 12 am the following Monday depending on the choice of Daily or Weekly calibration interval After the calibration has expired the message window will turn blue and you will be prompted to calibrate whenever you attempt a test that uses the test box microphones Your calibration curve should be similar to the one shown but may be at a different level It should remain stable over time Irregularities in the calibration curve may be the result of not properly aligning the microphones See Calibrating test box reference microphone 40 Verifit User s Guide Version 3 12 May 2015 Test box calibration audioscan 40 Scale dB SPL Calibrate 30 Last Fri Oct8 2 18pm 20 l Interval Weekly Expires Mon Oct 11 12 00am 10 1 Position reference microphone tip near coupler microphone inlet 0 2 Close test chamber 3 Select Calibrate 10 20 30 40 EN a A Y oo oh E A oh hl a EE 250 500 1000 2000 4000 8000 Calibrating test box reference microphone Remove any coupler from the coupler microphone before calibration 1 Uc mo me Bg Position the test box reference microphone opening concentric with the coupler microphone opening and about 1 2 mm from as shown below Close and seal the test chamber
101. box speaker overdriven Test box speaker overdriven or Test box right left speaker overdriven The first message indicates that the left test chamber speaker is unable to produce the SPL required for a test The second message will appear during the directional test if the right left speaker is unable to produce the required SPL Check that the two cables running between the test chamber and the main unit are securely connected Interchange the cables connecting the test chamber to the rear display unit No test box reference mic detected No test box reference mic detected This message may be displayed when starting a hearing instrument test It indicates that the Verifit is not measuring any sound at the test box reference microphone The test box reference microphone is the white microphone located in the test chamber Ensure that the test box reference microphone is secure Unplug the white test box reference microphone Plug the microphone back in again ensuring that it clicks into place Try the calibration procedure again Interchange the cables connecting the test chamber to the rear display unit Check the two 15 pin connectors on the rear of the test chamber Look carefully at the pins using an otoscope to make sure they are all the same length and are not bent If any have been pushed back into the connector you should contact Audioscan Unplug the test box reference microphone and plug the on ear probe micr
102. c may also be used as a test signal but it is not controlled for spectrum or level Some useful facts about broad band signals Overall SPL is the SPL in a band containing all signifi cant frequency components of the signal Spectrum level is the SPL in a band 1 Hz wide Band SPL is the SPL in a restricted frequency range If the signal is uniform in the band band SPL Spec trum level 10 log bandwidth A spectrum is the band SPL or spectrum level in a series of adjacent bands For a broad band signal the overall SPL is greater than the band SPL and the band SPL is greater than the spectrum level For a pure tone the overall SPL the band SPL and the spectrum level are the same A white noise signal has a spectrum level that is inde pendent of frequency i e constant SPL per Hertz A pink noise signal has a spectrum level that is in versely proportional to frequency i e constant SPL per octave A fractional octave band e g 1 3 octave has a band width that is proportional to frequency A pink noise signal has a flat spectrum when ana lyzed in fractional octave bands A critical band is a band within which the loudness of a continuously distributed signal of constant SPL is independant of bandwidth 2 1 Narrow band signals 2 1 1 Sinusoidal pure tones Sinusoidal signals are used in the ANSI hearing aid tests in Multicurve 2 cm frequency response tests gain or output in 2 cm and on ear sin
103. ce Average this cannot be changed REDD values are similar for adults and children If Headphone is selected as the transducer type adult average values will be used to transform dB HL audiometry to dB SPL 10 ABR nHL to eHL Normalized HL to estimated HL conversion factors Permitted only if Transducer 102 Verifit User s Guide Version 3 12 May 2015 ABR nHL Select from Default Enter If Enter is selected an entry screen will be provided after threshold data have been entered Otherwise default factors will be used These may be set to DSL values or to values that you have entered in Setup Note that in some facilities nHL is defined in such a way that it is effectively eHL in these cases ABR eHL should be selected and no conversion factors will be applied See ABR nHL to eHL setup Fitting to targets for soft speech See On ear or Test box mode Using Speechmap and Assessment data entry for setup and audiometric data entry 1 Select Audiometry to choose the target method and enter audiometric data 2 Select Test 1 and set stimulus to Speech ISTS Speech std 1 or Speech std 2 and level to 50 Elongated symbols show the target range for 50 dB speech LTASS 3 Adjust frequency shaping and gain for soft sounds so that the middle curve the LTASS falls within the target range especially between 500 4000 Hz Press Continue to run the complete passage Repeat as necessary
104. ch input This assumption is necessary to allow the microphone location effects to be incorporated For BTE and body aids the 2cc coupler values provided assume a fully occluding earmold with 13 tubing extending to the medial tip of the earmold and a standard canal length If a different type of mold is used alterations to these values should be made to account for the different acoustic characteristics For CIC instruments the 2cc values take into account that the instrument when deeply inserted into the ear canal will produce a greater SPL in the ear than that measured in the ITE coupler SPL or HL scale In Speechmap and Insertion gain tests you may view results in either dB HL or dB SPL Insertion gain tests view the hearing aid as improving the sound field threshold In Insertion gain the HL scale presents aided results as improved sound field thresholds while the speech region remains fixed Speechmap tests view the hearing aid as increasing the ear canal SPL Speech gets louder but the threshold remains fixed On the HL scale in Speechmap normal ear canal threshold becomes the 0 dB HL line and all data is replotted using this reference A physical interpretation of the data is difficult and the use of HL in Speechmap is not recommended All instructions given in this guide assume the SPL Speechmap scale To change the scale Highlight and lt PICK gt Scale to toggle between a dB SPL and dB HL scale Hide or show on ear curve
105. d by a related test in such cases the message bar will inform you of impending data loss erased by selecting Session and one of the Erase data choices or the power is turned off Setup data will be retained even after the power is turned off The Verifit database may be stored and restored via xml files on a USB drive or a networked PC share If the data exchange location is a network share you must first enable networking See Networking You must also share a folder on the PC e g c MyData and ensure that Change permissions are enabled To enable and configure file based data exchange 1 Te Qu BJ Press Setup then highlight and PICK Session Highlight and lt PICK gt Enable file based data exchange Highlight and lt PICK gt the storage file location USB drive or Network share For Network share connect a USB computer keyboard to the Verifit and fill in Computer Share name Username and Password not needed for Windows 95 98 Highlight and lt PICK gt each box to open it for data entry and again to close it or use the Enter key on the keyboard s number pad Highlight and lt PICK gt Test connection and wait for a successful report Press Continue to save the settings and exit the setup menu 35 Verifit User s Guide Version 3 12 May 2015 Storing and restoring data The Verifit database contains all the test and setup data for the Verifit at any point in time The Session s
106. d speech level 256 ms prior to the start of each speech passage and adjusting a digital filter to provide a flat response at the reference mi crophone The two Speech std signals are by the same male talker filtered to provide the long term average speech spectrum LTASS recommended by Cox amp Moore 1988 for average vocal effort This is the LTASS assumed in the Desired Sensation Level DSL method of hearing aid fitting In addition four spe cial versions of the Speech std 1 test stimulus are provided in Speechmap to assist in the adjust ment of frequency lowering hearing aids These are called Speech3150 Speech4000 Speech5000 and Speech6300 The Speech3150 stimulus has had the bands at 1000 Hz and above attenuated by 30 dB ex cept for the 1 3 octave band at 3150 Hz which is un attenuated Similarily the Speech4000 stimulus has an unattenuated band at 4000 Hz the Speech5000 stimulus has an unattenuated band at 5000 Hz and the Speech6300 stimulus has an unattenuated band at 6300 Hz Figure 4 For these stimuli the indicat ed level is for the unfiltered Speech std 1 passage and the band levels in all unattenuated bands are the band levels present in the Speech std 1 passage at that level These three signals may be used to deter mine the amount of frequency shift provided by fre quency lowering hearing aids and the sensation level of the lowered components of the speech signal The female and child signals are
107. d to simulate a telephone handset receiver SPLITS Coupler SPL for an inductive telephone simulator SPL developed in a 2cc coupler by a hearing instrument with the gain control in the RTP 1996 or RTS 2003 when the input is the magnetic field generated by a TMFS HFA or SPA SPLITS Average of the SPLITS at HFA or SPA frequencies STS 1996 simulated telephone sensitivity or RSETS 2003 relative simulated equivalent telephone sensitivity is calculated as HFA or SPA SPLITS minus RTG 60 A positive STS or RSETS indicates greater output when using the telephone than when using the microphone SPLIV Coupler SPL in a vertical magnetic field SPL developed in a 2cc coupler by a hearing instrument positioned as worn with the user gain control in the RTP 1996 or RTS 2003 when the input is a 31 6 mA m vertical magnetic field HFA or SPA SPLIV Average of the SPLITS at HFA or SPA frequencies TLS 1996 test loop sensitivity or RTLS 2003 relative test loop sensitivity is calculated as HFA or SPA 48 Verifit User s Guide Version 3 12 May 2015 SPLIV minus RTG 60 A positive TLS indicates greater output when listening in a room loop than when using the microphone ANSI telephone simulator TMFS test ANSI 53 22 requires that the gain control be set to RTP 1996 or RTS 2003 before running this test The reference test gain RTG is required in order to calculate the STS 1996 or RSETS 2003
108. e will appear on the display The heavier curve is the response to the signal from the left speaker while the lighter curve is the response to the signal from the right speaker 4 If the instrument is omni directional the two curves will be nearly identical If the instrument is directional the curves will separate indicating different output levels for sounds coming from different directions NOTE Most adaptive directional instruments require between 15 45 seconds of presentation before the adaptive function is activated and observable 5 Press Continue to capture the directional curves and end the test 6 Highlight and PICK Test 2 This is like Test 1 but without the speech If the directional response of the instrument is noise adaptive the curves will separate after 15 45 seconds A speech adaptive directional 117 Verifit User s Guide Version 3 12 May 2015 instrument will remain omni directional and no separation will be observed Press Continue to capture this directional test result and end the test Viewport Test box audioscan Test box directional 3 Scale dB SPL Test Stimulus Level Spkr Noise in Noise Front and Rear Response Speech 70 L Noise 64 Noise 70 Noise 70 R L R Hide Show Speech in Noise Front Response Speech in Noise Rear Response 1000 2000 4000 8000 Continue e Help 7 Pr
109. e ear canal A lubricant applied in the vicinity of the probe tube will ease insertion and prevent slit leaks 1 Set the instrument as it will be used with feedback suppression enabled and initialized 2 Highlight and lt PICK gt Test 1 As the speech passage plays observe the feedback bar and the lower graph A yellow Feedback bar and peaks with yellow markers in the lower curve indicate incipient feedback which may impact sound quality A red Feedback bar and peaks with red markers in the lower curve indicate feedback that may be audible and should be mitigated Press Continue to run the full speech passage and capture average results for the passage 3 Test2 is the same as Test 1 but uses live speech default 121 Verifit User s Guide Version 3 12 May 2015 4 The effects of jaw movements and the presence of hands hats and telephone handsets may be explored using these tests 5 Press Continue to close Feedback and return to the Viewport screen 122 Verifit User s Guide Version 3 12 May 2015 22 Troubleshooting This section covers common problems encountered when using the Verifit If you require further assistance note your model and serial number located next to the power switch and contact your local distributor or Audioscan at 519 268 3313 800 265 2093 USA only 519 268 3256 fax or service audioscan com PLEASE DO NOT SHIP YOUR UNIT BACK TO THE FACTORY In most cases we can courier you a
110. e hearing instrument until the recommended result is achieved In Test Box Mode press lt Continue gt to run one final stimulus sweep and to store the final output measure result 116 Verifit User s Guide Version 3 12 May 2015 Viewport Test box audioscan Audibility verification using Speechmap i ry Instrument Scale dB _ Audiometry Age Adult Transducer Headphone UCL Average i i RECD Average TERRITI De WM TINI Ny REDD Lu pni pt UP Test Stimulus Level SII 1 SpeechaSTS Soft 50 2 Speech4STs Avg 65 ajl MPO 90 Unaided 65 Curve Hide Show 1000 2000 4000 8000 Continue G9 Help e 9 Press Continue to close Audibility and move to Directional Viewport Test box directional test 1 On the Viewport Test box screen highlight and lt PICK gt Directional 2 Position the hearing aid in the test box See Coupling the hearing instrument Directional ITE positioning Directional BTE positioning Test box directional procedure 3 Highlight and PICK Test 1 This will introduce speech at 70 dB SPL default from the left speaker and noise at 64 dB SPL default from the right speaker At periodic intervals the level of the speech and noise is momentarily reduced and an additional burst is played from either the left or right speaker to measure the response from that direction Two curves one heavy line and one thin lin
111. e passage Loop System an assistive listening device that uses magnetic induction to carry a signal from a microphone amplifier to a wire loop The signal is picked up from the loop by a hearing aid set to the telecoil position or by a receiver with built in telecoil volume control and earpiece Loops are either worn around an individual s neck or can encircle a room such as a classroom providing an excellent signal to noise ratio 1 MAF minimum audible field SPL of a tone at the threshold of audibility measured in a free sound field for a subject listening with both ears and facing the sound source The SPL is measured with the subject removed from the field at the midpoint of an imaginary line joining the centers of the ear canal openings MAP minimal audible pressure SPL of a tone measured or inferred at the tympanic membrane at the threshold of audibility 133 Verifit User s Guide Version 3 12 May 2015 MPO Maximum Power Output the maximum SPL that a hearing aid can deliver in response to a steady narrow band input The stimulus may be pulsed a tone burst to avoid discomfort and to approximate an aided UCL measurement stimulus Modulation the process of varying a characteristic of one signal with another NAL National Acoustic Laboratories Australia NCA National Centre for Audiology Canada Nonlinear Region that portion of the input output function which is not a straight line at 45 degrees OSPL90 output
112. e that Change permissions are enabled 1 ay E Press lt Setup gt then highlight and lt PICK gt Printing Highlight and lt PICK gt Print to file Highlight and lt PICK gt the file type Bitmap bmp or Internet GIF gif Highlight and lt PICK gt Full screen Main window full screen without the message line or Active window foreground image only 34 Verifit User s Guide Version 3 12 May 2015 Connect a USB computer keyboard to the Verifit and fill in Computer Share name Username and Password not needed for Windows 95 98 Highlight and lt PICK gt each box to open it for data entry and again to close it or use the Enter key on the keyboard s number pad Highlight and lt PICK gt Test connection and wait for a successful report Press Continue to save the settings and exit the setup menu To save a screen image to a file press Print Network file File type Bitmap bmp v Print frame Main window v Computer My PC Ll Share name My Data LJ Username Me Ll Password INNEN Test connection NOTE To input a file name from a connected keyboard each time you print see Barcodes tabular data headers and comments on printouts To save all test data as an xml file see Storing and restoring data Storing and restoring data setup All measurement data curves displayed at the end of the test are stored until overwritten by repetition of the same test invalidate
113. e undgastuaesnueaunsbuedbvisvends 102 bittmne to tarcets for SOLE SPEE heson aeaea tee E Eit te n EE E E ERPER TEE POET RW DH RECHTE ERATES ELE ies 103 Fitting to targets Tot lond SOBDS 6 ee ette tinet ite bas rete operi e ha fecu cite e vapore Ret de vega enaccad 104 Fitting to targets Tor mid level speech ene eee eo Ro Dini ape re tede oo GE ER RU e uon 104 Open fittings im Speechmiap e csc ieccaiechbsaceseccaicatssdacs cluceaveibacess ovacad aces vias igeasscanoataadeavodees ee pae a ECOLE ER VERE Ee NE SERE NEUE 105 Verifying Frequency Compression Frequency Lowering Hearing Instruments in Speechmap 105 FM fiting and Verr ARTO aeaea e en e aaea TEAREN aar PRU RU ICH ti rit erp io OE tried 107 CROS fitting im Speechmap 2 trees tertie ere E IEEE ERE IEEE a EE ERE E RS Ree EPIS ea FOE US RES E BN ER ERR RAE Qe 108 T Lo p fitting and verification in Speechmap 2 2 0 tere erre eerte err tup ree e hd EH ERE RES epa oig 109 speechmap Technical Detail sy ci tei eene eI E OEE ep pere Qe ep re Ug Se P RUE ELA R EQ UR LESE s e ERE NER RU De ek eee E DUE 112 Speechmap SUMMIT ours ertet etd ret e ERE URL qo rete sev ig ete ee ERR EE e dede a ees eve dee er ed be ES 112 SAT EE R 112 Microphone location elfects 1 REIR RURE REUNIR REED GR EE NEM A ESA T HER Eod 113 Deep inserion COIipellsaHOD dco c te er er eti do abest tede nto uin ERE EROR DA Ue HERE desee r
114. eal Ear Aided Gain REAG Difference in dB between the REAR and the stimulus SPL or stimulus band SPL Real Ear Saturation Response RESR The REAR obtained using a narrow band signal at a level high enough to saturate the hearing aid usually 85 90 dB SPL Real Ear to Coupler Difference RECD Difference in dB between the SPL produced in the ear canal and the SPL produced in a coupler by the same sound source External sound field speaker setup In some installations the internal sound field speakers may not be convenient or may yield speaker overdriven errors because of severe standing waves from nearby walls or shelves In these cases an external speaker having a smooth response from 200 8000 Hz and an impedance of 4 ohms or greater may be connected to the Front on ear measure speaker connector on the rear connector panel The VA 111 speaker is available for this purpose The speaker should be mounted at ear height well away from reflective surfaces See Positioning the client To select this speaker Back Front zT Speaker Speaker 1 Press lt Setup gt then highlight and lt PICK gt Speakers 2 Highlight and lt PICK gt the Sound field speaker button to toggle between Internal and External 3 Press lt Continue gt to exit Setup For on ear directional tests connect an external speaker see requirements above to the back on ear speaker connector on the rear connector panel Position the bac
115. eech will be detectable if the 99th percentile is at or near threshold The Speech Intelligibility Index SII is maximized when the entire speech envelope idealized as a 30 dB range is above masked threshold This will not be an SII of 100 or 1 because of loudness distortion factors but higher SII values will not produce significantly higher scores on most test material The speech reception threshold SRT is attained when the LTASS is at threshold approximately depending on test material and the individual 114 Verifit User s Guide Version 3 12 May 2015 21 Viewport Viewport combines four of Verifit s digital hearing instrument verification tests Speechmap Directional Noise Reduction and Feedback into a single screen diagnostic and fitting suite This screen is available in either Test Box or On Ear mode and is preset with default procedures and input stimuli for each test to optimize efficiency These presets may be customized to suit practice preferences see Viewport Setup The Audibility test in Viewport is a preset version of Speechmap For more details see Speechmap Speechmap Fitting Procedures Viewport Test box 90 m 80 TO 70 80 amit NR 20 do f Tu 60 iii 60 LEID 50 40 30 40 EL 21 0 c c o i ME MES PR LL cR 80 0 SEU 10 Audibility 20 250 500 1000 2000 4000 8000 E Feedback 100 70 EVI UN a 60 50 80 40 70 30 60 250 500 1000 2000 4000 8000 50 5
116. eechmap with DSL5 0a NAL NL1 NAL NL2 CAMFIT Insertion gain with NAL RP NAL NL1 Fig6 Pogoll Berger Libby Sensory Loss Simulator Simulation types Linear conductive S EN Non linear outer hair cell cochlear loss Simulation DaNndS ccccssceccecesssseeeeesssssssssssseeeees 65 130 Verifit User s Guide Version 3 12 May 2015 131 Verifit User s Guide Version 3 12 May 2015 24 Glossary AGC Automatic Gain Control the means by which gain is automatically controlled by the level of the signal being amplified ANSI 83 22 AGC I input controlled AGC see input compression AGC O output controlled AGC see output compression AGRAM Abbreviation for audiogram ANSI American National Standards Institute Attack Time the time required for HA output to reach 3dB of its steady state level in response to an input step from 55 to 90dB SPL ANSI 3 22 ASP Automatic Signal Processing In hearing aids level dependent frequency response shaping AVC Automatic Volume Control slow acting AGC that attempts to maintain a constant average signal level BSPL Band Sound Pressure Level the SPL within a restricted frequency band BTE Behind The Ear hearing aid Compression a type of AGC in which an incremental change in the input level produces a smaller incremental change in the output level CR Compression Ratio the ratio of incremental change in input SPL to the
117. ely responsible for its content We acknowledge the support received from past and present staff at the National Centre for Audiology at UWO in implementing the DSL method Verifit User s Guide Version 3 12 May 2015 CAMFIT is used under license from Prof Brian C J Moore University of Cambridge UK We are indebted to the University of Memphis Hearing Aid Research Laboratory for permission to use some of their recorded speech material NAL NLI is used under license from the National Acoustics Laboratories Australia NAL NL2 is used under license from Hearworks Pty Ltd Australia Software licenses Audioscan distributes selected software components under various open source licenses These licenses generally give you the right to copy and change the affected component s software source code For details see the license files distributed with the software or contact Audioscan 10 Verifit User s Guide Version 3 12 May 2015 EC Declaration of Conformity Manufacturer European Authorized Representative CE marked Products Products Classification Certification Declaration audioscan A Division of Etymonic Design Incorporated EC Declaration of Conformity Etymonic Design Incorporated operating as Audioscan 20 Ludwig Street Ontario NOL 1G4 CANADA PC Werth Ltd Audiology House 45 Nightingale Lane London SW 12 8SP UK Model Verifit VF 2 Real Ear Hearing Aid Analyzer Commencing with Seria
118. ents are coupled to the HA 2 coupler by means of a 9 mm length of black Viton tubing The only purpose of this tubing is to seal the tip of the earhook to the coupler inlet All of the tubing required by ANSI 3 22 is machined into the metal stem of the HA 2 coupler The HA 2 coupler tubing should be inspected regularly for cracks which will cause feedback If the tubing is worn or damaged contact Audioscan for a replacement Alternatively it can be replaced by a 10 mm length of 13 heavy wall earmold tubing Custom instruments are sealed to the HA 1 coupler with putty so that the end of the eartip is flush with the inside of the coupler opening Putty should not extend into the coupler cavity or block the sound outlet of the instrument Vents should be sealed at the faceplate end It is very important that the instrument be well sealed to the coupler Open fit instruments must use the coupler and coupling system specified by the manufacturer This may involve a hook that replaces the open fit tubing or an adapter tube that may be sealed to the opening of the HA 1 coupler with putty RITE Receiver in the ear instruments are coupled to the HA 1 coupler using putty to seal the receiver module or soft tip to the coupler opening Excess low frequency output is usually due to open vents or a poor seal to the coupler For health reasons hearing instruments should be clean before putty is applied and putty should be replaced frequently Coupling the
119. equency component fundamental Harmonic Distortion the addition of harmonic components to a signal The rms value of a harmonic component of a signal as a percentage of the rms value of the fundamental If less than 2096 the rms value of the total signal may be used instead of the fundamental HFA High Frequency Average the average of values in dB at 1000 1600 and 2500 Hz ANSI 83 22 HL Hearing Level the hearing threshold referenced to the threshold of normal hearing expressed in dB HI Hearing instrument Input Compression a form of AGC in which the signal level is regulated before the volume control Input Output function steady state single frequency plot of the coupler SPL on the ordinate as a function of input SPL on the abscissa with equal decibel scale divisions on each axis ANSI 3 22 ITE In The Ear hearing aid Kneepoint compression threshold the point on an input output curve at which the slope digresses from unity indicating the signal level at which a non linear process begins to take effect 1 LCD liquid crystal display A thin planar information display Linear Region that portion of the input output function which is a straight line at 45 degrees Linear Amplification amplification having the same gain for all input levels until the maximum output of the device is reached LTASS Long term average speech spectrum the rms level of a speech passage in l 3rd octave bands averaged over the entir
120. er if used directly behind and facing the back of the client s head so that front and rear speakers are at the same height and are at the same distance from the center of the client s head 67 Verifit User s Guide Version 3 12 May 2015 Positioning the probe tube 1 Use an otoscope to ensure there is no ear canal obstruction e g cerumen and to get a sense of ear canal length Install a new probe tube on the probe module Set the black marker ring approximately 28 mm from end of probe tube for adult females approximately 30 mm from end of probe tube for adult males and approximately 20 25 mm from end of probe tube for children These positions may be modified based on the otoscopic examination Tip the probe module body is 28 mm long Hang the probe module on the ear as shown The reference microphone should face outwards Adjust the blue cord until the probe module is snug against the head directly below the earlobe cheek level To facilitate this clip the probe module cable to clothing on the side opposite the test ear and draw the cable snug Hold the front blue cord so that it passes behind the ear canal entrance and pass the end of the probe tube in front of the blue cord and into the ear canal Carefully slide the probe tube into the ear canal until the marker ring approaches the intertragal notch Then let the front blue cord move forward to hold the probe tube in place Use an otoscope to verify that the tube
121. erjet Pro 1660 and Deskjet models 3050 1000 D2680 D4160 6940 and 460 In Windows2003 Server you must add permission to allow Anonymous Logon to print to the shared printer 1 BE INS 6 Press lt Setup gt then highlight and lt PICK gt Printing Highlight amp lt PICK gt Other network printer or Windows shared printer Highlight amp lt PICK gt Printer details automatic if printer type is set to None Highlight amp lt PICK gt Printer type then select from HP Deskjet Color 1 single ink cartridge HP Deskjet Color 2 both color and black ink cartridges HP Laserjet Black PostScript or Other HP for a list of supported specific printer models Check Black only for black printouts on a color printer Connect a USB computer keyboard to the Verifit and fill in the boxes with the requested information Highlight and lt PICK gt each box to open it for data entry and again to close it or use the Enter key on the keyboard s number pad Obtain needed information from your network administrator Other network printer Printer type PostScript w Black only Postscript printers TP IP Address 172 30 184 Port 8100 LJ Press Continue to save the settings and exit the setup menu Printing to a network file To save the screen image as a file on a network PC you must first enable networking See Networking You must also share a folder on the PC e g c MyData and ensur
122. ess Continue to close Directional and move to Noise reduction 8 Viewport On ear directional test Refer to On Ear Measures Setup to prepare the system for use and for proper positioning of the client and the probe tube Insert the earmold tip or custom hearing instrument into the ear being careful not to advance the probe tube further into the ear canal A lubricant applied in the vicinity of the probe tube will ease insertion and prevent slit leaks 1 On the Viewport On ear screen highlight and lt PICK gt Directional 2 Highlight and lt PICK gt Test 1 This will introduce speech at 70 dB SPL default from the front sound field speaker and noise at 64 dB SPL default from the back sound field speaker At periodic intervals the level of the speech and noise is momentarily reduced and an additional burst is played from either the front or rear speakers to measure the response from that direction Two curves one heavy line and one thin line will appear on the display The heavier curve is the response to the signal from the front speaker while the lighter curve is the response to the signal from the rear speaker 3 If the instrument is omni directional the two curves will be nearly identical If the instrument is directional the curves will separate indicating different output levels for sounds coming from different directions NOTE Most adaptive directional instruments require between 15 45 seconds of presentation before the
123. ess the barcode trigger and center the red line on the barcode from a distance of 6 8 in 15 20 cm The scanner will beep and the Barcode entry poster opens 2 Highlight and PICK Done to accept the data indicated on the poster To enter assessment data and parameters manually 1 Highlight and lt PICK gt Audiometry metry Audio Ear Left Transducer Headphone 4 Threshold Entered REUR Average Cancel e Continue e Help a 2 Highlight and lt PICK gt Transducer then highlight and lt PICK gt from the list 3 Highlight and lt PICK gt REUR then highlight and lt PICK gt to toggle selection Measured REUR should be used with a soundfield threshold because individual REUR is part of the threshold Average REUR should be used with headphone or insert phone thresholds because individual REUR isn t part of these thresholds 4 When all selections have been completed press lt Continue gt 5 Enter HL threshold values using a mouse or keypad Left click the mouse on the audiogram form to enter a point Click again to delete the point On the keypad use the arrow keys to change frequency and level and press lt PICK gt to enter or delete a threshold point 6 Press lt Continue gt when all points have been entered The HL for the highest frequency is used for aided targets at higher frequencies REUR measurement procedure Performing a REUR test erases all existing REAR
124. est 2 to administer the same as Test 1 but with a different type of noise NOTE The order of noise stimulus presentations the type of noise used and the level of the noise stimuli can be configured through Viewport Setup in the Setup Menu Hearing instruments with noise reduction can vary in terms of their activation level If an expected noise reduction result is not obtained at a given presentation level try increasing the level and repeating the test 119 Verifit User s Guide Version 3 12 9 May 2015 Viewport Test box audioscan 130 Test box noise reduction 120 Scale dB SPL 90 Test Stimulus Level NR 80 1 Air conditioner 70 60 2 Vacuum 70 40 MT Curve Hide Show 30 Air conditioner 20 Noise reduction OFF 0 Air conditioner 10 Noise reduction maximum 20 10 1000 2000 4000 8000 Continue LJ Help m 6 Press Continue to close Noise reduction and move to Feedback Viewport Test box feedback test 1 On the Viewport screen highlight and lt PICK gt Feedback 2 For Test box tests connect the monitor headphones and position them with the hearing aid in the test box as shown in Feedback Suppression Test Set the volume control on the monitor headset for minimum gain rotate toward rear of test box and close the test box 3 Highlight and lt PICK gt Test 1 With the hearing instrument s feedback suppression off force the instrument into feedback by
125. est chamber Carefully observe the pins in the test chamber connector for any that are bent or pushed in Invalid on ear calibration Invalid on ear microphone calibration This message may be displayed during the on ear calibration procedure It indicates that the calibration curve is significantly different from what is expected It may be accompanied by an on ear reference microphone error Check that a probe microphone assembly is securely plugged into the PROBE socket of the side Right or Left you are trying to calibrate and that the cable has not become damaged Try using a new probe tube Ensure it is correctly attached and positioned Try switching right and left probe microphone assemblies Try switching the right and left cables connecting the rear display unit to the test chamber Carefully observe the pins in the test chamber connector for any that are bent or pushed in Sound field speaker overdriven Sound field speaker overdriven or External sound field speaker overdriven This message may occur in on ear directional or on ear unaided or aided tests if No external front speaker is connected but one has been selected in Setup See External display printer speaker External sound field speaker setup No back speaker has been connected but an on ear directional test is being attempted See External sound field speaker setup The test environment is too reverberant for the distance between the client and the speaker
126. ests gt then highlight and lt PICK gt Test box measures then highlight and lt PICK gt Manual control Highlight and lt PICK gt the Level window then highlight and lt PICK gt 0 from the drop down list Highlight then lt PICK gt the Frequency window then highlight and lt PICK gt the frequency of the calibrator e g 1000 Hz from the drop down list Highlight then lt PICK gt the Filter window then highlight and lt PICK gt 1 12th octave from the drop down list 42 Verifit User s Guide Version 3 12 May 2015 9 Highlight then lt PICK gt Start test which changes to Stop test 10 Check that the Coupler microphone level is within 1 dB of the calibrator level setting the calibrator accuracy For a 94 dB calibrator with 0 3 dB accuracy the indicated coupler microphone level should be 94 1 3 dB 11 To stop the measurement highlight and lt PICK gt Stop test Coupling the hearing instrument for ANSI tests The Verifit is supplied with 2 metal couplers a type HA 1 ITE and a type HA 2 BTE Note that an ANSI standard coupler for CICs does not exist These must be tested in the HA 1 coupler When threading the couplers onto the coupler microphone if is very important that they be firmly tightened to ensure a good acoustic seal Avoid twisting the coupler microphone cable turn the coupler not the microphone or unplug the microphone while tightening the coupler BTE instrum
127. ew OJ Format Graph rel Scale dH SPL He Audiometry Oi Age Adult Transducer Headphone UCL Average RECD Average REDD Average REAR Stimulus Level Sil 1 O Speech shape Avg 60 92 3 9 4 9 Unaided 160 Curve Hidef Show Q Speechmap Single view audicscan 140 DTE instrumen mE iol 130 Mode S REM 30 Presentation Single view C 120 xo ok Format Graph 1716 a i x Seale dB SPL 4 Aud bometry el Age Adult Transducer Headphone UCL Average RECD fwerage REDD Average REAR Stimulus Level Sii A OlSpeech shape Avg 60 4 E instrument 196 i f Mode E Presentation Single view 30 120 i i Format Graph Tol 116 x S x Seale dE SPL 20 2 O speech shape Avg 60 35 n i ajal m 10 iuc cA P uic s aep T T Unalded Ez a Curve Hide Show O Figure 11 When LTASS is at threshold SII 33 which corresponds approximately to SRT Speechmap Single view DET 146 TEE instrument BIE T _ Mode S REM 30 Presentation Single view 30 Format Graph ne Seale dB SPL 20 i Pe 3 Ol Bprech shape Avg 5 79 10 ES oc o EE E apr T T l Unalded 23 T Curve Hide Show Figure 12 The highest SII is obtained when the entire speech envelope is above threshold 99th Percentile of 1 3 Octave Band SPLs for Speech Signals Average Ef
128. f the foam tip Increase the tip size and or apply a lubricant to the foam tip to improve the seal If the RECD curve deviates more than 10 dB from the average in the 4 6 kHz region check for proper probe placement and possible blockage of the tube by the foam tip or cerumen When these curves are stable press lt Continue gt to save them For comparison purposes the DSL 5 0 age related average RECD is shown as a dotted curve on the screen If you have accessed RECD from the on ear tests list you may highlight and lt PICK gt the Age box to change the age for this reference curve RECD results The RECD measurement screen shows the transducer calibration in the in the 2cc coupler 1 and the response measured in the real ear 2 The difference between these curves is the RECD 3 The DSL5 0 age appropriate average RECD is shown for reference 4 A negative RECD below about 1 kHz often indicates a poor seal between the foam tip and the ear canal or an unsealed vent in an earmold A negative RECD above 1 kHz often indicates a blocked or pinched probe tube See RECD facts Calibration of RECD transducer Measure RECD RECD Protocols 81 Verifit User s Guide Version 3 12 May 2015 RECD audioscan 90 80 Max TM SPL 120 3 Presentation Single view Format Graph oO Scale dB SPL RECD coupling Foamtip Age Adult Calibrate RECD transducer RECD xder cal fd Last Wed Dec 10 8 53am
129. feedback suppression off force the instrument into feedback This may be accomplished by placing the monitoring headphones in the test box as shown see Monitor headphones With the test box closed adjust the monitor volume control until the feedback bar shows red during parts of the speech passage Then press lt Continue gt When the test has finished peaks should be apparent in one or both curves With feedback suppression enabled highlight and lt PICK gt Test 2 and select the same level used for Test 1 Then press lt Continue gt The peaks in the curves of Test 1 should not appear in the curves of Test 2 53 Verifit User s Guide Version 3 12 May 2015 REFERENCE COUPLER BATTERY MIC MIC PILL Directional function test Directional characteristics such as polar plots and Directivity Index DI are typically measured in a large anechoic chamber using sound from one direction and at one frequency at a time This means they apply only for a hearing aid set for linear amplification These are not conditions representative of real use The Verifit directional test measures directional performance in real time while using speech It is compatible with all forms of hearing aid processing including frequency lowering feedback compensation and other non linear algorithms The Verifit directional test presents speech at selectable levels from the left hand speaker and noise at a selectable signal to noise ratio from the
130. ff Summon Test Selection Menu containing a list of the available test procedures Summon Session Data Menu to erase export or import data Used in the Single View Mode to alternate between ears or A B Data Used in the Dual View Mode to navigate between ears or test panels Used in Help to switch between Help index and Help page Print on internal or external printer or print to file Move across screen columns Move within a screen column Select a highlighted item or operate a screen button Proceed from current state Revert to previous state 21 Verifit User s Guide Version 3 12 May 2015 Menus lists and buttons Menu buttons Screen buttons Test selection Audiometry oon Ear Left TESPESZTWESSUTES Transducer Headphone vj Threshold Entered On ear measures Sensory loss simulator Cancel o Help a As illustrated above menu buttons are gray rectangular bars containing descriptive text while screen buttons are a highlighted square at the right hand end of a white window A screen button with a down arrow indicates that it will summon a drop down list of options the current selection being shown in the window to its left A plain button toggles between two choices the current choice is shown in the window to its left REUR Average Cancel e Continue e Help Positioning the mouse cursor over a menu button changes it from gray to white positio
131. fort re LTASS for entire passage Hanning window 128 ms average 14 00 12 00 6 00 BAND SPL dB re LTASS 4 00 7 99th 9oile re LTASS STANDARD 2 00 99th ile re LTASS FEMALE 99th ile re LTASS CHILD 99th ile re LTASS ICRA k th ile re LTASS ISTS 0 00 200 250 315 400 S00 630 800 1000 1250 1600 2000 2500 3150 4000 5000 6300 8000 BAND CENTER FREQUENCY Hz Figure 13 Level of 99th percentile for Speechmap speech signals at average vocal effort 20 Ludwig St Dorchester A 30th Percentile of 1 3 Octave Band SPLs for Speech Signals Average Effort re LTASS for entire passage Hanning window 128 ms average 0 00 5 00 8 8 BAND SPL dB re LTASS a 8 25 00 30th ile re LTASS STANDARD 9 30th ile re LTASS FEMALE t 30th ile re LTASS CHILD 30th ile re LTASS ICRA kk 30th ile re LTASS ISTS 200 250 315 400 500 630 800 1000 1250 1600 2000 2500 3150 4000 5000 6300 8000 BAND CENTER FREQUENCY Hz Figure 14 Level of 30th percentile for Speechmap speech signals at average vocal effort Dynamic Range 99th 30th ile for Speech Signals Average Effort Hanning window 128 ms average 35 00 DYNAMIC RANGE dB 8 8 DYNAMIC RANGE STANDARD 500 9 DYNAMIC RANGE FEMALE DYNAMIC RANGE CHILD X CYNAMIC RANGE ICRA DYNAMIC RANGE ISTS 000 200 25 315 400 500 630 800
132. from questions 1 19 EXPLANATORY NOTES IMPORTANT Refer to Ii ions for f isclos nt for ical i rity for the proper interpretation of information provided in this form 1 The device if equipped with a QWERTY keyboard allows the oa to enter free form text when saving or printing data e This data can be stored and retrieved from a USB stick or networ 2 If an operator enters a header for printing that header will remain on the machine until it is cleared or overwritten 3 The device can import and export data and headers that may include ePHI but only in the event that PHI was entered by the operator The device can import export via network connection or transfer via USB stick 4 This document along with available phone support constitutes our support for HIPAA compliance 5 The Verifit and Axiom devices boot from internal flash memory The RMSOOSL device boots from a USB memory stick The devices can boot from removable media only if it contains software supplied by the manufacturer 6 There is no virus protection software available for the device it is not required as it is not possible to load or execute software on the device except that which is provided by the manufacturer 7 The device does not use any password protection and there is no device audit log 8 The device does not encrypt data and cannot save to encrypted media such as an encrypted USB Any PHI produced by the device should be de identified appropriately
133. g Instruments 42 9 20 23 Pearsons K S Bennett R L amp Fidell S 1977 Speech levels in various noise environments Project Report On Contract 68 01 2466 Washington DC US Environmental Protection Agency Platz Rainer 2004 SNR Advantage FM Advantage and FM Fitting Proceedings from the Ist International FM Conference www phonak com Scollie S D Seewald R C Cornelisse L E amp Jenstad L M 1998 Validity and repeatability of level independent HL to SPL transforms Ear and Hearing 19 5 407 413 Scollie S D Seewald R C Moodie K S Dekok K 2000 Preferred listening levels of children who use hearing aids Comparison to prescriptive targets JAAA 11 230 238 Scollie S Seewald R Cornelisse L Moodie S T Bagatto M Laurnagaray D Beaulac S amp Pumford J 2005 The Desired Sensation Level Multistage Input Output Algorithm Trends in Amplification 9 4 159 197 Seewald R C 1994a Current issues in hearing aid fitting In J P Gagne and N Tye Murray Eds Research in Audiological Rehabilitation Current Trends and Future Directions Journal of the Academy of Rehabilitative Audiology Monograph XXVII Seewald R C 1994b Fitting children with the DSL method The Hearing Journal 47 9 10 48 51 Seewald R C Moodie K S Sinclair S T amp Cornelisse L E 1996 Traditional and theoretical approaches to selecting amplification for infants and young children In Bess F
134. g in client response Repeat as necessary Running a new test may automatically hide the speech envelope of the previous test depending on the option chosen in Setup see Speechmap Speechmap Setup To redisplay highlight and lt PICK gt Hide Show then highlight and lt PICK gt the envelope display right column button for the test Fitting to targets for mid level speech 6 Select Test 3 and set stimulus to Speech ISTS Speech std 1 or Speech std 2 and level to 70 Elongated symbols show the target range for 70 dB speech LTASS 7 Adjust gain for mid level sounds so that the middle curve the LTASS falls within the target range Press Continue to run the complete passage Repeat as necessary Achieving this goal may require adjusting gain for soft speech which will reduce its audibility This may be a necessary compromise with some hearing instruments and for clients with a very narrow dynamic range 104 Verifit User s Guide Version 3 12 May 2015 Speechmap DSL 5 0a adult audioscan 140 Instrument BTE wi Mode Testbox Presentation Single view g 120 Format Graph vi 110 Scale dB SPL Ll 100 Audiometry 90 Age Adult 80 _ Transducer Insert Foam UCL Average 70 RECD Average 60 BCT N A Binaural No 50 40 30 f Test Stimulus Level SII 1 Speech4STS Soft 50 30 20 T oem 2 MPO 90 INIA 10
135. ghlighted 4 To add a session to an existing file 1 Use the mouse or the arrow keys on the keypad or connected keyboard to move the highlight in the list OR start typing the file name on a connected keyboard The highlight will move to the closest match as you type 2 When the desired file name is highlighted press lt PICK gt or left click on the Client ID button you can always left click on any file in the list to select it without highlighting it This will put the file name in the Client ID window and close the list 3 Pick Continue to store the current session data to the file in the Client ID window with a new session number appended 5 To add a new file to the Client ID list 1 Display the Client ID list and start typing the new file name As you type the first matching entry in the list will be highlighted and this highlight will move as you type the highlight will disappear when the file name you have typed does not duplicate an existing name 2 When you finish typing the Client ID click on the Client ID button or press lt PICK gt This will close the drop down list and leave the new file name in the Client ID window 3 Pick Continue to store the current session data to the file in the Client ID window NOTE A style sheet audioscan xsl is automatically saved with the data file To open the saved data file in Excel right click on the file and select Open With Microsoft Excel When prompted for a st
136. gle frequency manual tests in Insertion gain tests and in tone burst maximum output MPO tests The MPO stimu lus consists of a series 128ms tone bursts with 128ms gaps at an SPL of 90 dB SPL in the test box and 85 dB in the sound field Frequencies used are 1 12 oc tave except for the MPO test which uses 1 3 octave frequencies Levels from 40 to 90 dB SPL are available at the reference microphone Control of the level at each frequency is maintained by measuring the fre quency response of the signal path to the reference microphone 256 ms before each test using a 256 ms 50 55 dB SPL multi tone complex or a 256 ms chirp depending on the test to follow Drive levels at each frequency are then set to achieve the desired band levels at the reference microphone For on ear mea surements tones are frequency modulated triangle 396 over 128 ms 2 2 Broad band signals 2 2 1 Pink Noise signal The pink noise signal is available for Multicurve 2 cm coupler gain and output frequency response mea surements and for Insertion gain and Speechmap on ear measurements It is a pseudo random sig nal composed of 1024 simultaneous tones summed to provide a crest factor of 12 dB The spectrum of the pink noise signal is controlled by the reference microphone in conjunction with a digital feedback loop with a frequency resolution of 1 12 octave and a response time of about 1 3 of a second Pink noise was selected as a test signal because i
137. gnal The PCR measures the degree to which a large amount of power is concentrated at a small number of frequencies in the hearing aid output see Freed amp Soli in References In the Verifit the PCR is the ratio of the average power of the dominant frequency components in a 1 12 octave band to the power in the entire band expressed in dB Because the gain of a compression hearing aid varies with the signal it is processing the PCR is calculated in real time while a speech signal is presented to the hearing aid The upper graph shows the LTASS for the speech signal while the lower graph shows the PCR relative to the PCR for speech without feedback Feedback results in a peak in the speech spectrum and in the PCR Incipient feedback results in a peak in the PCR curve Refer to On Ear Measures Setup to prepare the system for use and for proper positioning of the client and the probe tube 1 Insert the earmold tip or custom hearing instrument into the ear being careful not to advance the probe tube further into the ear canal A lubricant applied in the vicinity of the probe tube will ease insertion and prevent slit leaks 2 Set the instrument as it will be used with feedback suppression enabled and initialized 3 Press Tests then highlight and lt PICK gt On ear measures then highlight and lt PICK gt Feedback 4 Highlight and lt PICK gt Test 1 and set the Stimulus to Speech std 1 or 2 and the level to 50 or 60 dB SPL As the
138. gt then highlight and lt PICK gt Test box measures then highlight and lt PICK gt Manual control 2 Highlight and lt PICK gt the Level window then highlight and lt PICK gt the desired stimulus level from the drop down list 3 Highlight and lt PICK gt the Frequency window then highlight and lt PICK gt the desired frequency from the drop down list Distortion measurement data is available only from 200 4000 Hz 4 Highlight and lt PICK gt Start test to start the test Start test changes to Stop Test To stop the measurement highlight and lt PICK gt Stop test You may change Level and Frequency without stopping the test 59 Verifit User s Guide Version 3 12 May 2015 Sound level meter using manual control When set for a stimulus level of 0 dB off the Manual control mode allows the Verifit to be used as a sound level meter Sound at the test box reference microphone and the coupler microphone may be analyzed by 1 12th octave A weighted or C weighted filters A and C weighted measurements are limited to frequencies above 100 Hz and the averaging time and update rate are 384 ms 1 2 Press Tests then highlight and lt PICK gt Test box measures then highlight and lt PICK gt Manual control Highlight and lt PICK gt the Level window then highlight and lt PICK gt 0 dB stimulus level from the drop down list Highlight and lt PICK gt the Filter window then highlight and lt PICK g
139. h your Verifit It is required to transfer software updates from a PC to the Verifit Please STORE IT IN A SAFE PLACE You may download the latest software from www audioscan com or request that a CD ROM be mailed to you Instructions for transferring the software update from your PC to the Verifit will be included with the software download or the CD ROM If your Verifit has a CD ROM drive serial number less than 4671 you may download the latest software from www audioscan com and burn it to a CD ROM Alternately you may request that a CD ROM be mailed to you To install the new CD ROM Under Setup select CD ROM then select Open CD drive Press the OPEN button on the door of the CD drive The door should open Remove the old CD ROM by pressing on the center spindle and gently lifting the outside edge Teo S P Position the new CD ROM on the spindle printed side up and press gently downward until it snaps into place 5 Gently push the CD drive door inward until it snaps closed 6 Select Continue and follow on screen instructions If the CD drive door fails to open in step 2 switch the Verifit OFF and back ON and press the OPEN button on the CD door within 3 5 seconds The door should open Switch the Verifit OFF and install the new CD ROM Switch it ON and follow any on screen instructions If necessary to open the CD drive without power insert the end of a small screwdriver or paper clip in the hole near the light on t
140. he CD drive door Note that the CD ROM must be present in the CD drive for normal operation 23 Verifit User s Guide Version 3 12 May 2015 4 General Setup This section covers Date and Time setup Display settings including mouse pointer speed setting and Saving test setup Date and time setup To set the date and time that appears on printouts and calibration screens 1 Oe uoa S Press Setup then highlight and lt PICK gt Date amp Time on the Setup poster To change the date highlight and lt PICK gt the month window to display a drop down list of months Highlight and lt PICK gt the desired month on the list Repeat the previous step to change the date year and time in the appropriate windows When the new date and time information has been set press Continue to exit Display settings To change the screen language screen saver timing and the background color for charts for both the internal display and any connected external monitor Press Setup then highlight and PICK Display To change the screen language highlight and PICK Language to toggle between English and German To change the idle time before the screen saver blanks the screen to prolong display life highlight and lt PICK gt the Screen saver window Highlight and lt PICK gt the desired screen saver timing from the drop down list To change the background color of the graphic display on the various
141. he power in the fundamental If less than 2096 the power of the total signal may be used instead of the fundamental For most hearing aids the inclusion of harmonics above the third will not significantly alter the THD ANSI 83 22 Transducer a device which transforms energy from one form to another For example a microphone or earphone UCL Uncomfortable Listening Level the level for a specified stimulus that is judged to be definitely 135 Verifit User s Guide Version 3 12 May 2015 uncomfortable VGA video graphics adapter VC Volume Control a user operated gain control Warble Tone a frequency modulated sine wave The modulating signal is often a low frequency triangle wave 1 Valente M Strategies for Selecting and Verifying Hearing Aid Fittings New York Thieme Medical Publishers Inc 1994 ANSI S3 5 Methods for Calculation of the Speech Intelligibility Index 1997 ANSI S3 6 Specification for Audiometers 1996 ANSI S3 22 Specification of Hearing Aid Characteristics revised 2003 ANSI S3 46 Methods of Measurement of Real Ear Performance Characteristics of Hearing Aids 1997 136 Verifit User s Guide Version 3 12 May 2015 25 References AAA Clinical Practice Guidelines Remote Microphone Hearing Assistance Technologies for Children and Youth Birth 21 Years Supplement A Fitting and Verification Procedures for Ear level FM Draft 2007 American National Standards Institute 1997
142. ignificance in terms of both speech detec tion and speech under standing Figure 8 Output left and Gain right curves for a linear hearing aid generated using a swept tone 1 and pink noise analyzed in 1 12 octave bands 2 Dual view not available in RM500SL 3 2 Real speech signal analysis One of the most used measures of a speech signal is the long term average speech spectrum LTASS This is a 1 3 octave spectrum averaged over a sufficiently long portion of the speech material to provide a sta ble curve In practice a 10 second average meets this Generally speech will be detectable if the L1 level is at or near threshold The Speech Intelligibility Index SII is maximized when the entire speech envelope idealized as a 30 dB range is above masked threshold This will not be an SII of 10096 or 1 because of loudness distor tion factors but higher SII values will not produce sig nificantly higher scores on most test material g The speech reception threshold SRT is attained when the LTASS is at threshold approximately de pending on test material and the individual These scenarios are shown in Figures 10 12 which follow It should be noted that analysis methods which use shorter time periods produce higher peak levels and significantly different speech envelopes In order to produce results that can be directly compared to mea sures of threshold and UCL the analysis time period needs to approxima
143. ill be subtracted from the measured RECD to obtain an HA 1 RECD without earmold effects The actual earmold will be introduced during test box simulation but error will exist equal to the difference between the earmold measured on the RECD transducer and the average earmold that was subtracted RECD facts Individual RECD values are derived by comparing the SPL produced by a sound source in the closed ear canal to that produced by the same sound source in a 2cc coupler It is commonly assumed that the RECD so measured is a property of the individual ear and is independent of the sound source used to obtain it making it useful for 1 converting HL threshold and UCL obtained using insert phones to SPL values 2 simulating real ear measurements from 2cc coupler measures test box and 3 deriving 2cc coupler targets from real ear aided targets However this assumption is true only if the acoustic impedance of the sound source is significantly higher than the acoustic impedance of the ear canal or the coupler This is the case for RIC ITE and ITC hearing aids and is approximately true for insert earphones with the supplied foam tips The acoustic impedance of insert earphones drops if the foam tip is replaced by an earmold or the tubing that forms part of the HA 2 coupler At some frequencies for BTE hearing aids with their earhooks and earmold tubing or the HA 2 coupler tubing the acoustic impedance approaches that of an adult ear and falls below
144. ime speech valleys and the middle curve is the average Starting a test causes the signal to be presented continuously the speech signals run in a loop and the curves are updated frequently to show any changes you make to the hearing instrument Pressing Continue restarts the speech passage and the curves are then calculated for the entire passage producing an accurate display of the speech region and LTASS and an accurate SII calculation When using live speech a Freeze curve button captures short term speech features See SII calculation in Speechmap and Speechmap Technical Details Before starting please see On Ear Measures Setup Speechmap Setup Speechmap facts On ear or Test box mode 95 Verifit User s Guide Version 3 12 May 2015 To run a test highlight and lt PICK gt one of the 4 Test buttons Then highlight and lt PICK gt Stimulus to select the stimulus type Highlight and lt PICK gt Level to select stimulus level Press Continue to run the test and To access Speechmap press Tests then highlight and lt PICK gt On ear measures or Test box measures then highlight and lt PICK gt Speechmap To change screen setup see On Ear Measures Screen Setup and On ear or Test box mode To set up hearing instrument type highlight amp lt PICK gt Instrument then highlight amp PICK BTE ITE ITC CIC RITE receiver in the ear test box mode Open On ear mode Body CROS On
145. joining the microphone ports is at 45 and horizontal Locate the test box reference microphone at the front microphone opening on the faceplate and seal any vent at the faceplate Note which speaker L or R is in front of the hearing instrument for reference Other positions may be preferable for some instruments REFERENCE COUPLER BATTERY MIC MIC PILL Direction of maximum sensitivity Directional BTE positioning Use the provided coupler clip to keep the instrument off the floor of the test chamber The directional BTE instrument should be positioned so that a line joining the microphone openings on the instrument is at 45 as shown Position the test box reference microphone at the front microphone opening on the instrument Note which speaker L or R is in front of the hearing instrument for reference Other positions may be preferable for some instruments 55 Verifit User s Guide Version 3 12 May 2015 REFERENCE COUPLER BATTERY MIC MIC PILL Axis of microphone openings Test box directional procedure To test directional function in the test chamber 1 2 Mount the hearing aid to the appropriate coupler see Coupling the hearing instrument Position the hearing instrument in the test chamber as shown in 9 6 Directional ITE positioning or 9 7 Directional BTE positioning Press Tests then highlight and lt PICK gt Test box measures then highlight and lt PICK gt Directional Highlight
146. k speaker directly behind and facing the back of the client s head so that front and rear speakers are at the same height and are at the same distance from the center of the client s head This speaker will be automatically used for the on ear directional test On ear calibration facts The probe microphone and its associated tubing does not have a flat frequency response The on ear calibration 63 Verifit User s Guide Version 3 12 May 2015 process compares this response with the flat factory calibrated response of the on ear reference microphone and compensates all subsequent probe tube measurements for this difference It may be performed as often as desired but will be invalidated at 12 am the following day or at 12 am the following Monday depending on the choice of Daily or Weekly calibration interval After the calibration has expired you will be prompted to calibrate whenever you attempt a test that uses the on ear measurement microphones It is suggested that a copy of the calibration curves for the probe modules when new be posted near the Verifit for comparison with daily or weekly curves If there is a drift in calibration with time the module may need replacement See Calibration check for probe module Calibration should be repeated if a probe module is replaced or if a probe tube with different dimensions is installed Switching left and right probe modules after calibration will result in the wrong calibration curve
147. kground noise Adjust the hearing instrument so that the REIG curve SPL scale or Aided threshold curve HL scale approximates the dotted target curve For multi level targets match each curve using the stimulus level indicated Press Continue to complete the test and capture the data See Insertion gain in SPL and Insertion gain in HL for an explanation of screen curves See SII calculation in Insertion gain 88 Verifit User s Guide Version 3 12 May 2015 NOTE Because it is analyzed in 1 3 octave bands the Noise stimulus produces a REAR up to 12 dB below that produced by the Swept stimulus at the same overall level The REIGs will be similar except at levels which cause non linear operation of the hearing instrument SII calculation in Insertion gain The Verifit calculates a Speech Intelligibility Index SIT value for unaided speech at 70 dB SPL REUR the target REIG and for each aided test The calculations use the 1 3 octave band method of ANSI S3 5 1997 without the 160 Hz band and without masking effects with results expressed as a 96 by multiplying by 100 Level distortion effects are included but no hearing loss desensitization is applied An idealized speech region of LTASS 15 dB is used The speech recognition associated with a given SII is a function of the test material and the cognitive abilities of the listener There is considerable individual variability in relating the SII to speech recognition especia
148. kgroup Save option Web Port 80 Self test Service Session NOAH Port 8080 Change Speakers Service Speechmap Viewport Continue LJ Help em Note for network administrators To manually change networking settings uncheck Auto and click the Change button NOAH Service Port Consult your Network Administrator before changing the NOAH service port Changing the port successfully requires understanding the security polices on your Windows PC and computer network The Audioscan NOAH Module communicates with the Verifit through the NOAH network service The Verifit provides the NOAH service on a TCP port The Windows computer running the module must be configured to access the same TCP port which is 8080 by default Some Windows anti virus software packages and some network firewalls prevent access to specific ports including 8080 Using the NOAH module in the presence of such security settings may necessitate changing the NOAH service port Note that changing the NOAH service port requres restarting the Product software Changing the NOAH service port 1 Press Change next to the NOAH service port 2 Select the appropriate five digits to enter the desired port number The software will prevent you from entering the same port as the Product web service typically port 80 27 Verifit User s Guide Version 3 12 May 2015 Change NOAH service o mis mio miis mio mi Port 8080
149. l Number C0900 Model RMSOOSL Real Ear Hearing Aid Analyzer Commencing with Serial Number A1715 Model Axiom Real Ear Hearing Aid Analyzer Commencing with Serial Number B1000 Model Verifit VF 1 Real Ear Hearing Aid Analyzer Commencing with Serial Number 3879 Class lla after MDD Annex IX Rule 5 EC Certificate CE 543241 issued by the British Standards Institution for compliance with Annex V section 3 2 of European Union Council Directive 93 42 EEC as amended by Directive 2007 47 EC concerning medical devices We hereby declare that the above mentioned devices comply with the legislation regulating medical devices in the United Kingdom transposing European Medical Devices Directive 93 42 EEC namely Statutory Instruments 2002 No 618 Consolidated legislation and the Medical Devices Amendment Regulations 2008 No 2936 which transpose Directive 2007 47 EC into UK law Further we also declare that Verifit VF 2 commencing with Serial Number C1267 and Axiom commencing with Serial Number B1954 comply with the legislation regulating certain hazardous substances in electrical and electronic products in the United Kingdom transposing the provisions of the European Parliament and Council Directive 2011 65 EU RoHS2 namely the Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment Regulations 2012 SI 2012 No 3032 as amended the RoHS Regulations 2012 Date of Validity April 15 2015 T C
150. l for headphones used to monitor coupler and probe microphone signals are provided on the front right side of the test chamber Verifit User s Guide Version 3 12 May 2015 There are connectors on the rear of the main display unit for 4 USB devices flash drives a QWERTY keyboard mouse printer barcode scanner external speakers an external HDMI monitor and connection to a network LAN serial number 4671 and higher Units with serial number below 4671 have connectors for 2 USB devices an external VGA monitor parallel printer external speakers a local area network LAN and an RS223 serial port not supported in this version of software Electrical supply input requirement 100 240 Vac 47 63 Hz 250VA A hospital grade grounded outlet is required Associated items and supplies VA 100 Soft case for Verifit VA 111 External speaker with folding stand and clips for microphone extension cables VA 120 Barcode scanner for reading barcoded audiometric data on printouts from Audioscan analyzers VA 131 Microphone extension cable 3 for use with Audioscan analyzers VA 133 Microphone extension cable 10 for use with Audioscan analyzers VA 201 NOAHQ module allows a networked PC running NOAH to exchange data with Audioscan analyzers RE201 25 Thermal printer paper for the internal printer in the Verifit RE367 36 Probe microphone tubes for single patient use 36 per bag SAFETY WARNINGS and NOTICES For purposes of IEC 6
151. l pure tone threshold If nHL is selected the entered data will first be converted to eHL before SPL threshold and fitting targets are calculated To do this appropriate eHL to nHL conversion factors must be applied You can choose to apply default conversion factors or enter new ones for each client This setup allows you to select the default conversion factors that are applied in Speechmap DSL to convert ABR nHL threshold to eHL threshold 1 Press Setup then highlight and lt PICK gt ABR eHL to nHL 2 Highlight and lt PICK gt DSL defined or User defined 3 For User defined enter conversion factors using a mouse the keypad or a keyboard See Assessment data entry When using the barcode option both entered nHL data and the nHL to eHL conversion factors are printed as a single barcode See Barcode data input Positioning the client Sound reflections from nearby surfaces including the operator can cause large measurement errors especially if the client moves between REUR and REAR measurements Room noise can increase test time cause errors and alter the operation of the hearing instrument being evaluated 1 Choose a quiet location and position the client and the sound field speaker at least 1 5 m 5 feet away from any hard surfaces 2 Position the client directly in front of and facing the sound field speaker at a distance of 45 to 90 cm 18 to 36 in from the center of the head 3 Position the back speak
152. lated tone tone burst pink noise dual direction noise calibrated or live speech Freq modulation sawtooth 3 over 128 ms Stimulus levels for tones 40 85 dB SPL in 5 dB steps Test stimulus accuracy at reference mic for tones 2000 8000 Hz 3 dB SPL Equalization Method real time modified pressure method PEERS stored for open fittings Frequencies per octave swept tones 12 Frequencies per octave tone burst 3 Analysis bandwidth speech noise 1 3 octave Measurement accuracy at 1 KHz 1 dB Measurement accuracy re 1 kHz 1 5 dB 200 5000 Hz phone eee ee I D 2 5 dB 5000 8000Hz Measurement Range 30 135 dB SPL 200 2500 Hz Bh rs dete Sa enr isles ite 30 140 dB SPL 2500 8000Hz ANSI S3 46 1997 tests available P M Real Ear Unaided Response tht Real Ear Aided Response TIC Real Ear Occluded Response Mod Siete ua RU RAE DUIME Real Ear Insertion Gain Other tests available ER Speechmap real speech audibility measures EEE Real time adaptive directional verification E ES E A EEE eeu On ear harmonic distortion E E T ET On ear spectral analysis ER On ear noise reduction verification E M cies On ear feedback suppression verification Manual measurement of output gain and distortion VIEWPORTO audibility directional noise reduction and feedback suppression verification Fitting methods available Sp
153. liances listed in the following table are met with the supplied RECD transducer microphones headphones mouse and keyboard connected and with unterminated speaker cables 2 USB cables 2 Ethernet cable parallel printer cable serial cable and VGA display cable connected The connection of other devices may result in increased emissions Verifit User s Guide Version 3 12 May 2015 Guidance and manufacturer s declaration electromagnetic emissions The Verifit is intended for use in the electromagnetic environment specified below The user of the Verifit should assure that it is used in such an environment Emissions test Compliance Electromagnetic environment guidance E The Verifit uses RF energy only for internal function RF emissions um i Group 1 Therefore RF emissions are very low and not likely to CISPR 11 i cause any interference in nearby electronic equipment RF emissions Class A CISPR 11 T E The Verifit is suitable for use in all establishments Harmonic emissions Class A other than domestic and those directly connected to IEC 61000 3 2 the public low voltage power supply network that Voltage fluctuations flicker uai e supplies buildings used for domestic purposes emissions Complies IEC 61000 3 3 Warranty Trademarks Acknowledgments The Audioscan Verifit is manufactured by Etymonic Design Inc 20 Ludwig St Dorchester Ontario Canada NOL 1G4 Web site www audioscan c
154. lly amongst impaired listeners The following shows expected nominal recognition scores vs SII for normals when using a variety of speech stimulus conditions Killion and Mueller Hearing Journal January 2010 pp 10 15 SII Cor Cor Cor Digits IEEE NU6 cum es Words 3 6 912 15 18 21 a4 ge KT 4 SENTENCES SPONDEES IEEE WORDS IN SENTENCES 100 L8 D 99 L3 100 100 m z 0 5 z 2 I A nr fe Ge bo Yl I S 1 SE CLICLI I I 0 10 20 30 40 50 60 70 80 90 100 SII speech intelligibility index in 96 CROS fitting using Insertion gain See Insertion gain in SPL 1 Place a probe module on each ear and insert the probe tube into the good ear only Position the CROS instruments on in the ears and turn them ON 2 Position the speaker at 45 degrees to the good ear and set Instrument to BTE 3 Select REAR 1 and record a response using Pink noise at 55 It should be like a normal REUR If not the ear may not be fully open 89 Verifit User s Guide Version 3 12 May 2015 4 Position the speaker at 45 degrees to the poor ear 5 Set Instrument to CROS 6 Select REAR 2 and obtain a response using Pink noise at 55 Adjust the response to match that obtained in step 3 7 Position the speaker directly in front of the client Select REAR 3 and use Pink noise at 55 to check for a smooth response Repeat with Instrument set to BTE An irregular
155. luating frequency lowering hearing aids Pink noise at levels of 50 to 75 dB SPL in 5 dB steps and a tone burst at 85 or 90 dB SPL are also available The two Speech std signals are by the same male talker filtered to provide the long term average speech spectrum LTASS recommended by Cox amp Moore 1988 for average vocal effort This is the LTASS assumed in the Desired Sensation Level DSL method of hearing aid fitting In addition one of these passages the Carrots passage has been filtered to suppress the 1 3 octave bands above 1 kHz by 30 dB with the exception of a 1 3 octave band at 4 kHz Speech4000 a band at 5kHz Speech5000 and a band at 6 3 kHz Speech6300 These latter three signals may be used to determine the amount of frequency shift provided by frequency lowering hearing aids and the sensation level of the lowered components of the speech signal The ICRA noise female and child speech signals are presented as recorded with no spectral shaping The ISTS consists of 500 ms segments from recordings of 6 female talkers reading the same passage in American English Arabic Chinese French German and Spanish These segments have been spliced together with appropriate pauses and filtered to match the average female spectrum from Byrne et al An international comparison of long term average speech spectra J Acoust Soc Am 96 1994 2108 2120 The 15 second version of this signal has been provided Live speech may also be used
156. mate 1 3 octave bands Figure 7 Using 1 3 octave bands for analysis of broad band signals allows measured levels to be compared more readily to narrow band behavioral measures such as threshold For this reason analy sis of broad band signals in all On ear measurements including Speechmap Test box mode is in 1 3 octave bands Other analyzers use narrower analysis bands sometimes having constant bandwidth As shown in Figure 7 this can result in significantly underestimat ing the audibility or comfort or discomfort of a com plex signal It should be noted that in all On ear measurements 1 3 octave band SPL is displayed and reported when saving data to a file at 1 12 octave frequencies which provides curve smoothing and causes the spectrum of narrow band signals to appear broadened When calculating overall rms from these data the SPL at 225 Hz and subsequent 1 3 octave increments should be used Analysis of broad band signals in all Test box tests except Speechmap is in 1 12 octave bands and the band SPL is displayed at 1 12 octave frequencies Analysis Bandwidth Used by Various Analyzers To Analyze Complex Signals 35 e Verifit RM500SL Speechmap E 1 24th Octave Analyzers 30 1 G The Normal Ear Critical Bands 100 Hz band analyzers N on 20 amp 10 Log Analysis Bandwidth Hz 0 E T T T T T T T 200 250 315 400 500 630 800 1000 T T T T T T T T
157. mplified speech audible and comfortable while avoiding discomfort for loud sounds Originally speech was simulated using amplitude modulated tonal signals The Verifit replaces these simulated speech signals with real speech both recorded and live For details of the test signals and analysis methods see Speechmap Technical Details Speechmap departs from insertion gain target methods in presenting amplification goals in the context of the residual auditory area not as an isolated target line and in the use of real speech not tones or broad band noise This is extremely important for non linear hearing aids analog or digital because their processing is signal dependent It also makes provision to correct audiometric data and 2cc coupler measurements for age related or individually measured acoustic differences between real ears and the couplers used for calibration and testing The Speechmap environment provides two hearing instrument verification options on ear measures and test box measures See On ear or Test box mode for details DSL 5 0 in Speechmap 4 ad DSL jo Copyright DSL 2004 Version 5 0 The Desired Sensation Level DSL method is a systematic eardrum sound pressure level SPLogram approach to hearing instrument fitting that seeks to ensure amplified speech will be audible and comfortable while loud sounds will not be uncomfortable It takes into account individual acoustic factors in audiometric and electroacoustic dat
158. n Stimulus Speech std 1 Level Soft 55 M RMS level 65 5 dB Cancel 9 Continue ee Cancel B Continue eP Example of two custom files click wav and I1khztone wav in the stimulus list To remove custom stimuli from Speechmap close any Test prompts and disconnect the USB stick from the Verifit Notes Files that are greater than 20 seconds in duration will be truncated to 20 seconds Speechmap will show up to 10 compatible WAV files If you have more than 10 we recommend that you use multiple USB sticks or organize your files into folders moving them into the top level directory of the USB stick as needed 98 Verifit User s Guide Version 3 12 May 2015 Removing the USB stick while a Test post is open may cause unexpected behavior Close the Test post before removing the USB stick from the Verifit Creating WAV files for Speechmap WAV is a commonly used format for digital audio and can be created edited by nearly all audio editing and recording software A WAV file has many properties that define the format of the digital audio When a USB stick is connected to the Verifit Speechmap looks for files in the top level directory that have the following properties File format WAV Data format PCM no compression Sampling Rate 32 kHz Bit precision 16 or 32 bit Channels Mono File name 15 characters or less not including wav extension Existing WAV files can
159. n the input signal is a 1 kHz tone at 65 dB SPL and the average of the currents when the input signal is 90 dB SPL at the HFA or SPA frequencies Avg 90 dB Battery life is estimated assuming 80 quiescent and 20 Avg 90 dB use With the hearing instrument set as normally used 1 Install and connect the proper battery pill See Battery pill use and care 2 Press Tests then highlight and lt PICK gt Test box measures then highlight and lt PICK gt Battery drain 58 Verifit User s Guide Version 3 12 May 2015 3 Highlight and lt PICK gt Battery type and select from drop down list 4 Highlight and lt PICK gt Hours per day and select from drop down list 5 Highlight and lt PICK gt Start test Battery drain audioscan emm Start test g 1 Acoustic input 0dB 1 67 mA Avg 90dB 5 61 mA Battery type Zinc air675 v Hours per day 12 Y 5 1 Estimated new battery life 163 to 224 hours 44 RES to 18 5 days Estimates are for guidance only Battery life varies with use conditions 3 end manufacturer 2 b 1 0 Quiescent 1kHz 65dB Avg 90dB Manual control procedure Manual control displays the reference microphone SPL the coupler microphone SPL their difference in dB gain and coupler microphone signal distortion at any selected 1 12th octave frequency and at a selected input level from 40 to 90 dB in 5 dB steps and at 0 dB off 1 Press lt Tests
160. n the screen prompt disappears Press lt Continue gt to resume the test During the AGC test the Verifit will pause to request that AGC controls or programmable parameters be set for maximum AGC effect If the manufacturer does not provide settings to produce maximum AGC effect use 46 Verifit User s Guide Version 3 12 May 2015 settings that result in the highest gain for soft sounds and the lowest gain for loud sounds This will typically result in the lowest compression threshold a flat I O curve and the longest attack release times These are not typical characteristics but indicate the adjustment range possible for these parameters If you are unsure which test sequence to run try AGC first If attack and release times are all near zero the instrument is probably linear ANSI test results In 1996 tests Full on average gain is measured at 50 dB SPL average gain at RTP is usually but not always measured at 60 dB SPL and the frequency response is run at 60 dB SPL for linear aids or at 50 dB SPL for AGC aids In 2003 tests Full on average gain 1 is measured with a 50 dB input SPL average gain at RTS 2 is always measured at 60 dB input SPL and the frequency response curve 3 is always run at 60 dB input SPL ANSI 3 22 2003 AGC audioscain Presentation Single view Ll A Format Graph Scale dBSPL Ies l Starttest Gain control full on OSPLSO curve Max OSPL90 dB 125 61120
161. necessary and without moving the hearing instrument adjust the user gain control until the large vertical arrow on the screen prompt disappears Press lt Continue gt to resume the test If you are unsure which test sequence to run try AGC first If attack and release times are all near zero the instrument is probably linear ANSI 2003 Linear and AGC tests 1 Press lt Tests gt then highlight and lt PICK gt Test box measures then highlight and lt PICK gt Linear or AGC Highlight and lt PICK gt Start test and follow the test setup instructions which are presented Refer to Test Box Measures Setup Coupling the hearing instrument Positioning the hearing instrument and Battery pill use and care to prepare the instrument for testing Turn the instrument ON Set the gain control manual or programmable to maximum with all other controls set to provide the widest frequency response greatest gain and highest maximum output AGC controls and or programmable parameters should be set to minimize AGC action AGC off or threshold high compression ratio close to 1 Press lt Continue gt to run the test or press lt Cancel gt to abort the test Note that if required the Verifit will pause during the test to request that the gain control be adjusted to the Reference Test Setting RTS If necessary open the HIT chamber and without moving the hearing instrument adjust the gain control until the large vertical arrow o
162. ng and Storing Results for details The Verifit may also be connected to a single computer using a network router switch or hub Note that sharing data with NOAH is done over this network connection Failure to follow operating instructions could place the user or operator at risk Networking requirements Connection of the Verifit to a computer network requires a Cat 5 RJ 45 cable The Verifit can connect to a local area network LAN using either automatic or static internet address assignment Most home and small office networks use automatic addressing These networks have a DHCP server Dynamic Host Configuration Protocol Special purpose networks might use static address assignment provided by the network administrator Networking setup Check Networking requirements and connect the Verifit to your network 1 Press lt Setup gt and then choose Network from the Setup menu 2 In the Network poster select Enable 3 In most cases your network will support automatic address assignment DHCP and you need only select Auto and click on Test 4 Ifthe test is successful your computer domain address and port assignments will be reported 26 Verifit User s Guide Version 3 12 May 2015 Setup network ANSI Date amp Time pee Enable IC Display Address 17230 4 91 Auto use DHCP Chan ge Max TM SPL Test Network nHL to eHL Domain ETYMONICDESIGN Test Printing Wor
163. ng instrument type ITC 0 0 0 9 1 2 0 8 1 0 0 2 0 4 0 9 0 5 CIC 0 0 1 3 1 8 1 2 1 3 0 2 0 1 0 4 0 0 BOD 3 0 3 0 3 0 3 0 4 0 3 0 2 0 0 0 0 0 Deep Insertion Add to Est Canal SPL CIC 1 9 1 9 2 6 3 3 4 0 4 6 5 2 5 8 6 0 113 Verifit User s Guide Version 3 12 May 2015 1600 4 9 3 9 3 7 4 2 0 0 6 1 2000 6 1 6 9 6 9 8 1 4 0 6 1 2500 1 8 5 1 5 5 7 4 3 0 6 4 3150 0 4 2 7 2 9 5 7 2 0 6 6 4000 0 2 6 0 4 8 8 6 0 0 7 7 5000 2 6 10 4 7 9 12 7 0 0 8 1 6300 3 0 5 2 1 2 9 0 0 0 8 4 8000 3 7 1 6 0 4 3 5 0 0 8 4 Microphone location effects are added after the overall rms level has been set Note Microphone location effects remeasured 2014 on KEMAR and referenced to sub lobe position Software versions prior to 3 10 56 use MLE values from DSL 4 1 so slight changes in Test box Speechmap should be expected Deep insertion compensation The deep insertion of a hearing aid or ear mold causes the ear canal SPL to be higher than would be estimated by adding RECD to the coupler SPL measured in the test box This most commonly occurs with Completely in Canal CIC hearing aids When this hearing aid type is selected in Speechmap Test box a deep insertion factor is automatically added to the estimated ear canal SPL The factor in the following table is from DSL 5 0 and has been interpolated to 1 3 octave frequencies Speech signal analysis One
164. ng microphone for the purpose of measuring the sound level produced in the standard coupler by a hearing aid and a custom keypad b an analyzer display unit housing a flat panel video display power supply signal generation measurement and control electronics and two sound field loudspeakers c two real ear measurement microphone assemblies each housing a reference microphone for controlling the signal from the sound field speakers and a probe microphone connected to a thin silicone tube which may be inserted into the ear canal for the purpose of measuring the sound level in the ear canal produced by a hearing aid d a miniature earphone used to measure the real ear to coupler difference RECD useful in estimating the sound level produced in an individual ear from measurements in the standard earphone coupler The analyzer attaches to the acoustic test chamber via two 15 conductor cables The acoustic test chamber provides connectors for the microphones used for controlling the stimulus and measuring the response For HIT mode a reference microphone coupler microphone and a battery simulator are normally connected via connectors provided inside the acoustic test chamber For REM mode two probe modules each containing a reference microphone and a measurement microphone and a real ear to coupler difference RECD earphone are normally connected via connectors situated on the front of the acoustic test chamber A connector and volume contro
165. ning it over a window with a screen button changes the button from dark gray to light gray Left clicking the mouse operates the selected button A menu button or the window containing a screen button selected using the keypad or a QWERTY keyboard is surrounded by a heavy line and is operated by pressing the lt PICK gt round key on the keypad or the Enter key on the numeric keypad on a QWERTY keyboard This process also selects the highlighted item in a drop down option list Screen messages and Help The Title bar top line of the display screen informs you of the selected Test e g Speechmap The Message bar bottom line of the display screen suggests the next step in a test or informs you of the state of the instrument or conditions that could affect your data For example it will inform you if the microphones need to be calibrated Context sensitive help is available by pressing Help or Fl on a connected QWERTY keyboard The Left Right key or a mouse may be used to switch between the Help index left panel and the Help page right panel The side sliders on each panel may be used to scroll through the Help index or long Help pages This may also be accomplished using the S arrows the scroll wheel on the mouse or the arrows on a QWERTY keyboard 22 Verifit User s Guide Version 3 12 May 2015 Software updating If your Verifit does not have a CD drive serial number 4671 and higher a USB flash drive was shipped wit
166. nm b Encrypted prior to transmission via a network or removable media as C Restricted to a fixed list of network addresses i e host based access control list eeee Does the device ensure the integrity of the ePHI data with implicit or explicit error detection correction technology _ tRecommend use of ECRI s Universal Medical Device Nomenclature System UMDNS Adapted from Information Security for Biomedical Technology A HIPAA Compliance Guide ACCE ECRI 2004 ACCE the American College of Clinical Engineering ECRI formerly the Emergency Care Research Institute MDS v 1 0 2004 11 01 Side 1 2004 HIMSS All rights reserved 141 Verifit User s Guide Version 3 12 May 2015 Manufacturer Disclosure Statement for Medical Device Security MDS RECOMMENDED SECURITY PRACTICES If possible do not create ePHI ePHI can only be created if a QWERTY keyboard is connected to the device Not providing a keyboard is an effective way of restricting the creation of ePHI In the event that ePHI must be produced the device is capable of outputting ePHI in several different forms as disclosed in this document Any data containing ePHI should be de identified before storing whether it is to hard copy network file or USB If de identification is not possible physical access to the device or hard copies of data should be restricted to authorized personnel and saving to USB sticks should be prohibited
167. nsitization is applied An idealized speech region of LTASS 15 dB is used The speech recognition associated with a given SII is a function of the test material and the cognitive abilities of the listener There is considerable individual variability in relating the SII to speech recognition especially amongst impaired listeners The following shows expected nominal recognition scores vs SII for normals when using a variety of speech stimulus conditions Killion and Mueller Hearing Journal January 2010 pp 10 15 SII Cor 9o Cor Cor a IEEE NU6 x Digits Sentences Words n VI ier ol i 4 8 n BP f Zonen 19 Wy Five Pnrheeneenceentgpienndomeetd SENTENCES i 7 DI Xe i l Sod 36 9 p WEH NUG WORDS 45 y 56 63 70 76 99 gI ok i i aks 100 99 87 10 20 30 40 50 60 70 80 90 100 93 SII speech intelligibility index in 96 90 100 100 96 Using custom stimuli in Speechmap Custom digital sound files can be used as stimuli in Speechmap If you connect a USB stick with WAV files on it to the Verifit Speechmap will make those files available as stimulus selections This feature provides the freedom of using any stimulus in Speechmap with all the features that Speechmap offers Please note that fitting targets are not available for custom stimuli A USB stick is required for this feature It is highly recommended that the USB stick is formatted for data using the Audi
168. o Normal threshold AJ Al L_ MAP Unaided avg 65 26 OO eS ALD DD Hide Show 250 500 1000 2000 4000 8000 95 Verifit User s Guide Version 3 12 May 2015 Screen tour aided screen 140 130 120 110 100 Speechmap DSL 5 0a child audioscan f f Instrument BTE v Estimated UCL Mode Testbox 90 dB target tones X Presentation Single view Resultof Speech LTASS Format Graph F Test2 peaks Seale dB SPL LJ Audiometry Age 86 months Transducer Insert Foam UCL Average wA RECD Average Fit to target range peT MA 65 dB speech Binaural No Speech intelligibility Index Test Stimulus Level SII 1 Speech std 1 Avg 65 75 Selectto ca 2 MPO 90 NIA m cr start atest E All Unaided avg 65 29 Curve Hide Show hc o a ET SST es les n 250 500 1000 2000 4000 8000 On ear or Test box mode The Speechmap environment provides two hearing instrument verification options On ear measures and Test box measures Using on ear mode the stimulus is controlled by the on ear reference microphone below the ear and SPL in the ear canal is measured by the probe microphone In test box mode levels measured in the 2cc coupler are converted to estimated ear canal levels using the RECD values age appropriate average entered or measured In addition the stimulus deli
169. o reete ie oreet tee ave EHE RELY O Ie ee Ue bate ee ee AES ET ed oye ien 37 5 Test Box Measures Setups cetero terre rette oett ete tenere treo p e r E ee eroe Se Ee bet ve e eee see Eaa oieee Y Eo E Aeaee ERR S qd 38 Test DOR STEC M n 38 lusu M 39 SC m 39 Fudegr Show test DO qoi P 39 Verifit User s Guide Version 3 12 May 2015 ANSI test frequencies e e e PR EE E EHE Ene FE FUE EVE ERR MEER PUE RE TER aE ERE MUR HEAR ELE S ERRORI 40 Test Dox calibtation tier rr 40 Calibrating test bak reference Microphones te oerte rne e e er tet eret reel rer isescis tee ern ree een acevo 41 Calibration check Tot coupler anierophliopi amp 32 breed detiene aa EEE et eet P dr e e eaea deed ed 42 Coupling the hearing instrament f r ANSI tests inre eric eren einen raa eE THE PIRE DUREE NER NER E ERE ER eed 43 Coupling the hearing instrument for Test box Speechmap 1 e retour nee toti ere eed Pe iK oii eire Tan E E rin oboe ag 43 POSIMOMING the hearing msumeno e enero reete ette dece erre o Hir ER eee Wages ERA Eve XXe Eoo RERS 44 9 ANSI Hearns Ald Testsieger re be t tecti e Fn EE AA LESER VERI ESEE N E ET ER REAS 45 ANSISS 22 0996 facts mienia aan a a Oe A Ea E od ol php a UELLE GERE RH cal 45 A
170. of Test 1 amp Test 2 are not similar the presence of the FM receiver has changed the intended performance of the hearing aid Where possible make programming adjustments to compensate being careful not to make adjustments that will change Test 1 results Move the hearing aid attached to the coupler and microphone outside the test box at least 12 in 30 cm away from the FM transmitter Put FM transmitter microphone set to Omni within 2mm of the reference microphone in the test box With the FM transmitter unmuted repeat step 2 Note that the hearing aid is outside the test box during this test Quiet please The results should be within 2 dB of the results from step 3 If not change FM settings and repeat A coupler mic extension cable is available See Microphone connection Real ear verification of FM only open fittings in Speechmap based on AAA Clinical Practice Guidelines Remote Microphone Hearing Assistance Technologies for Children and Youth from Birth to 21 Years April 2008 Open fittings must be verified in On ear mode 1 2 Enter Audiometry data and select FM from the Instrument list box Position the transmitter microphone as in step 4 above Place the probe tube in the ear canal and couple the FM only device to the ear canal as in normal use At maximum volume setting select the MPO stimulus Adjust the receiver settings to meet targets See Fitting to targets for loud sounds At use volume setting
171. om Phone 800 265 2093 USA only 519 268 3313 Fax 519 268 3256 Email info audioscan com or service 9 audioscan com The authorized representative for this product in the European Community is P C Werth Audiology House 45 Nightingale Lane London UK SW12 8SP Phone 44 0 181 675 5151 Fax 44 0 181 675 7577 Warranty The Verifit is warranted against defects for two years from date of purchase Within this period it will be repaired without charge for parts labor or return shipping when returned prepaid to your authorized Audioscan service agent This warranty does not apply to equipment that in our sole judgment has been subject to misuse or unauthorized alteration or repair This warranty does not apply to battery substitutes pills which carry a 90 day warranty This warranty does not cover battery substitutes used in a hearing aid manufacturing facility Trademarks Audioscan Axiom Speechmap Verifit and Viewport are registered trademarks of Etymonic Design Inc DSL is a registered trademark of the University of Western Ontario All rights reserved HP LASERJET is a registered trademark of Hewlett Packard Company NOAH is a registered trademark of the Hearing Instrument Manufacturer s Software Association QUEST is a trademark of Quest Technologies Inc PostScript is a registered trademark of Adobe Systems Inc Acknowledgments DSL 5 0 is used under license from the University of Western Ontario UWO which is sol
172. onak Video Focus 2 Booklet Stofa Switzerland Phonak A G Sinclair S T Seewald R C amp Cole W A 1996 A new real ear fitting system Because no two ears are alike Hearing Review 3 6 46 48 Skinner M W 1988 Hearing Aid Evaluation Englewood Cliffs Prentice Hall Inc Smith D A 1990 Technological report Acoustometry Hearing Instruments 41 11 40 44 Valente M Potts L G Valente M Vass W amp Goebel J 1994 Intersubject Variability of real ear sound pressure level Conventional and insert earphones Journal of the American Academy of Audiology 5 390 398 Valente M Strategies for Selecting and Verifying Hearing Aid Fittings New York Thieme Medical Publishers Inc 1994 Zelisko D L C Seewald R C amp Whiteside S 1992 Comparing three procedures for predicting the ear canal SPL at LDL ASHA 34 10 139 Verifit User s Guide Version 3 12 May 2015 26 Appendix 1 Manufacturer Disclosure Statement for Medical Device Security 140 Verifit User s Guide Version 3 12 May 2015 Manufacturer Disclosure Statement for Medical Device Security MDS Device Category Hearing Aid Analyzer Manufacturer Etymonic Design Inc Document ID Document Release Date Device Model Verifit RM500SL Axiom Software Revision See Page 1 of Users Guide Software Release Date See Page 1 of Users Guide Manufacturer or Titl Representative Contact Information Company Name Telephone
173. operating system Can the device owner operator a Apply device manufacturer validated security patches ccscccscccecsseecscescessuseeesseeseuerscscessueuscesesseueesesseeuseeee b Install or update antivirus software cesses C Update virus definitions on manufacturer installed antivirus software eeeeeeeee i d Obtain administrative privileges e g access operating system or application via local root or admin account _ No _ Does the device support user operator specific ID and password iseeeeeeeee eene nennen nnn nnne nnns No Are access sessions terminated after a predetermined length of inactivity e g auto logoff s essssersessrssssrsrenesesse Events recorded in device audit log e g user date time action taken Can the audit log record a Login and logout by users operators b Viewing Of ePHI siescisscsccccsssncpdsncasssacieses C Creation modification or deletion of ePHI d iImportfexport or transmitial recelpt of ePEL 2i eese itbabva a Ress aea an su e kane Re saeE o Does the device incorporate an emergency access break glass feature that logs each instance of use Can the device maintain ePHI e g by internal battery during power service interruptions sssessrseesssererenesenee Controls when exchanging ePHI with other devices a Transmitted only via a physically secure connection e g dedicated cable see
174. ophone in its place Try test box calibration using the reference microphone of the on ear probe microphone in place of the test box reference microphone If this is successful the test box reference microphone is defective and must be replaced Invalid test box calibration Invalid test box microphone calibration This message may be displayed during the test box calibration procedure It indicates that the calibration curve is significantly different from what is expected It may be accompanied by a missing test box reference microphone error e Check that the there is no coupler on the coupler microphone and that the microphones are correctly positioned for test box calibration e Check that the coupler microphone is securely plugged into the correct socket Follow the suggestions in No test box reference mic detected No on ear ref mic detected No right or left on ear reference mic detected 125 Verifit User s Guide Version 3 12 May 2015 This message may be displayed when starting an On ear test It indicates that the Verifit is not measuring any sound at the on ear probe reference microphone Check that a probe microphone assembly is securely plugged into the PROBE socket of the side Right or Left you are trying to calibrate and that the cable has not become damaged Try switching right and left probe microphone assemblies Try switching the right and left cables connecting the rear display unit to the t
175. oscan Updater prior to using this feature The Audioscan Updater comes with any current Audioscan software download or Cd Visit www audioscan com to obtain software updates To use digital sound files as stimuli in Speechmap 1 Connect a USB stick to your PC 97 Verifit User s Guide Version 3 12 May 2015 110 100 90 DE Gao Ue qe SUA OBS Format the USB stick for data using the Audioscan Updater Create digital sound files that are compatible with Speechmap see Creating WAV files for Speechmap Copy the WAV files from the PC to the top level directory i e not in any folder of the USB stick Disconnect the USB stick from the PC and connect it to the USB port on the Verifit Start a Test in Speechmap see Using Speechmap lt PICK gt Stimulus Compatible WAV files will appear as selectable options in the stimulus list below the default stimuli You may need to scroll down to see all the stimuli lt PICK gt your custom stimulus After a short delay your stimulus will begin playing Use your new stimulus with all the features of Speechmap audioscan Instrument BTE vi Mode Testbox Presentation Single view Format Graph Seale dB SPL Jj Audiometry Age Transducer Speech std 2 UCL SpeechtSTS Speech live AES Speech3150 BCT Speech4000 Binaural Speechs000 REDD Speech6300 ICRA noise Pink noise click Curve 1khztone i
176. presented as re corded without any processing and have been cho sen to provide a range of spectra The ISTS was developed under the European Hearing Instrument Manufacturers Association EHIMA which holds the copyright The sound file is available free of charge from the EHIMA website The ISTS consists of 500 ms segments from recordings of 6 female talk ers reading the same passage in American English Arabic Chinese French German and Spanish These segments have been spliced together with appropri ate pauses and filtered to match the average female spectrum from Byrne et al An international compari son of long term average speech spectra J Acoust Soc Am 96 1994 2108 2120 For more details con sult the EHIMA website www ehima com The ICRA distorted speech signal is a recording of an English speaking talker that has been digitally modi fied to make the speech largely unintelligible The resultant signal has many of the properties of real speech but has a harsh sound and lacks harmonic structure The latter may be significant for hearing aids which use this property of speech to control noise reduction schemes The LTASS is similar to the Speech std signals up to 5 kHz Overall SPLs of 50 55 60 65 70 and 75 dB at the reference microphone are available Soft and Aver age levels 50 70 dB SPL have the same spectrum A Loud vocal effort filter is applied to the 75 dB level signals This is shown in Figure 5
177. r BSPL as a function of frequency at a specified measurement point in the ear canal for a specified sound field with the hearing aid in place and turned on ANSI 3 46 RECD Real Ear to Coupler Difference difference in dB as a function of frequency between the SPL or BSPL produced by an insert transducer at the eardrum and in a 2cc coupler HA 1 or HA 2 coupler should be specified REDD Real Ear to Dial Difference difference in dB as a function of frequency between the SPL or BSPL measured at the eardrum and the audiometer dial setting that produced it It is specific to the client headphone and audiometer used to generate it REIG Real Ear Insertion Gain difference in dB as a function of frequency between the REAG and the REUG taken with the same measurement point and the same sound field conditions REIG REAG REUG ANSI 3 46 REOG Real Ear Occluded Gain difference in dB as a function of frequency between the SPL or BSPL at a specified measurement point in the ear canal and the SPL or BSPL at the field reference point for a specified sound field with the hearing aid in place and turned off ANSI S3 46 REOR Real Ear Occluded Response SPL or BSPL as a function of frequency at a specified measurement point in the ear canal for a specified sound field with the hearing aid in place and turned off ANSI 3 46 The 134 Verifit User s Guide Version 3 12 May 2015 REOR is used to evaluate the se
178. r measures then highlight and lt PICK gt Occlusion Highlight and lt PICK gt Start test Start test changes to Stop Test While the client vocalizes ee in a normal voice highlight and lt PICK gt Stop test to stop the test and freeze the screen A red occlusion bar indicates an occlusion problem a yellow bar indicates a possible problem and a green bar indicates no problem Increase venting and repeat the test until a green bar is obtained Stimulus Off Stimulus of Stimulus Off Filter C Weighted Filter C Weighted Filter C Weighted Probe microphone 53 5 dB Probe microphone 62 5 dB Probe microphone 67 0 dB FTTTTTTTTTTTTTTTTTTTTTCTTTTAO OODDUETTTTTTTTUTTTTTTTTTTTTTTTTAO pCTTTTTTTTTTTTTTTUCTTTTOTUOTT 0 10 20 30 40 50 60 70 80 90100110120130 0 10 20 30 40 50 60 70 80 90100110120130 0 10 20 30 40 SO 60 70 80 90100110120130 Reference microphone 49 0 dB Reference microphone 51 0 dB Reference microphone 50 5 dB FTTTTTTTTTUTTTTTTTTTTTTTTTTTA TTTTUTTTTTTTTTTTTTTTTTT TT TTTTTTTTTTTTTTTTTTTTTT IZA 0 10 20 30 40 50 60 70 80 9010010120130 0 10 20 30 40 50 60 70 80 80100110120130 0 10 20 30 40 50 60 70 80 90100110120130 Occlusion 45 dB Occlusion ns dB Occlusion 16 5 dB FTTTTTTTTTTTTTTTTTTTTTTTTTTITTT TTTTTTTTTTTTTTTTTTTTTTTTTTTTT TTTTTTTTTTTTTTTTTTTTTTTTTTTTT 0246 81012141618202224262830 0 2 4 6 8 101214161820 2224262630 0 2 4 6 8 10121416 1820 22 242628 30 78 Verifit User s Guide Version 3 12 May 2015 1
179. r opening Excess low frequency output is usually due to open vents or a poor seal to the coupler For health reasons hearing instruments and earmolds should be clean before putty is applied and putty should be replaced frequently Positioning the hearing instrument 1 The hearing instrument should be coupled to the appropriate coupler and a battery or battery pill installed See Coupling the hearing instrument and Battery pill use and care 2 Place the instrument and coupler in the test chamber so that the microphone opening s of the instrument are on the crossbar within the test zone 3 For directional instruments the direction of maximum sensitivity should be oriented toward the left speaker See Directional ITE positioning and Directional BTE positioning for special positioning considerations for the directional test 4 Position the test box reference microphone as close as possible to the front facing microphone opening of the hearing instrument without touching it REFERENCE COUPLER BATTERY MIC MIC PILL 5 Close and seal the test chamber 44 Verifit User s Guide Version 3 12 May 2015 9 ANSI Hearing Aid Tests These tests follow the procedures of ANSI 3 22 1996 or ANSI 83 22 2003 as selected in Setup See 1996 or 2003 ANSI standard Linear An automated test sequence for linear hearing aids per ANSI S3 22 AGC An automated test sequence for AGC hearing aids per ANSI 83 22 Input Output 1 4 cu
180. rdless of the acronym it is a narrow band SPL that should never be exceeded RECD Select from DSL Average Enter Measure if the target rule is DSL child or adult NL2 Average Enter Measure if the target rule is NAL NL2 or Average Enter Measure otherwise The RECD is used to convert entered HL data thresholds and UCL s to SPL values on the Speechmap screen when Insert Foam or Insert Mold is selected as HL Transducer and to convert coupler SPL measured in the test box to estimated ear canal SPL The DSL child and NAL NL2 fitting rules provide differing age appropriate average RECDs which will result in differing SPL thresholds Estimated ear canal SPL always uses DSL data when RECD set to average If Measure is selected you will be required to measure the client s RECD values or accept values from the RECD test If Enter is selected HA 2 or HA 1 RECD values may be entered and are required at all 9 audiometric frequencies When Enter or Measure is selected you will be required to specify the coupling in use between the RECD transducer and ear RECD Coupling Select from Earmold Foam tip Specifies the coupling between the RECD transducer and ear A correction will be applied when entering HA 2 referenced RECD data and when measuring with earmold Binaural Select from Yes No Determines if fitting targets will be adjusted for binaural summation effects This is excluded for DSL child targets REDD Real ear to Dial Differen
181. red 1 To initialize press lt Setup gt then highlight and lt PICK gt Self test 2 Highlight and lt PICK gt Initilize Unit will automatically restart 123 Verifit User s Guide Version 3 12 May 2015 Test box high distortion or noise High distortion and or noise numbers in an ANSI test There may be a leak between the hearing instrument under test and the coupler it is connected to For BTE type instruments check the integrity of the 13 tubing at the end of the coupler where it joins with the ear hook Look for cracks ITE type instruments need to have a good seal between the hearing instrument and the coupler In addition all vents need to be closed from the faceplate side of the hearing instrument Ambient room noise may be leaking into the test chamber Air conditioners computer fans and similar noisemakers can yield artificially high noise figures Check the sealing of the test chamber Try turning off suspected noise sources to identify the cause Vibration may be coupled into the test chamber from other equipment on the same table or wooden floor Computers fans and air conditioners may be the source of the vibration Try turning off suspected sources to identify the cause Relocate the source or the Verifit test chamber or mount the test chamber on a foam pad Test box curves inconsistent The test box curves keep changing from test to test The battery may be close to end of life or starved for air zinc
182. response to the back speaker signal The two curves will be nearly identical for a non directional instrument in a sound booth or acoustically dead room Setting the instrument for directional operation should produce a separation of the curves 4 On the Test control poster highlight and lt PICK gt the Level window then highlight and lt PICK gt a level 73 Verifit User s Guide Version 3 12 May 2015 from the drop down list For an adaptive directional instrument a stimulus level between 60 and 70 dB should cause the separation to change over a 15 45 second period For a noise reducing instrument both curves may change with time and stimulus SPL 5 Highlight and PICK Speech S N within the Test control poster and select a signal to noise ratio from the list box A S N ratio between 0 and 6 dB will usually induce directional performance after 15 45 seconds Optionally highlight and lt PICK gt Speech S N and select Off This presents noise alternating between the front and back test speakers Speech adaptive directional instruments may appear non directional if Speech S N is Off 6 Press Continue to capture curves or press Cancel to abort the test Captured curves are labeled F front speaker response and B back speaker response followed by the test number 1 4 On ear feedback test This test shows the LTASS upper graph and the power concentration ratio PCR lower graph for a speech si
183. resulting incremental change in output SPL Used to characterize steady state AGC action can be a function of input level duration and frequency CROS Contralateral Routing Of Signals a type of hearing aid in which the microphone is at the ear opposite to the one receiving the amplified sound CORFIG coupler response for flat insertion gain the transformation added to real ear insertion gain to Obtain 2 cc coupler gain Assumes linear amplification Coupler a device used to acoustically couple an earphone or hearing aid to a measurement microphone and to provide an acoustic load DSL Desired Sensation Level Method a systematic eardrum SPLogram approach to the hearing aid fitting process that seeks to ensure amplified speech will be audible and comfortable while loud sounds will not be uncomfortable Directional hearing aid a hearing aid for which the gain is dependent on the direction of sound incidence when measured under free field conditions ANSI 3 22 Equalization process of controlling the SPL or band SPL of the stimulus as a function of frequency at the field reference point ANSI S3 46 Expansion a type of AGC in which an incremental change in the input level produces a larger incremental change in the output level FM frequency modulation a method of transmitting information in which the frequency of a radio wave carrier is varied modulated by the information signal Also a method of reducing standing w
184. rial LAN SB2 ack Left Right Verifit connector panel serial number below 4671 The RS232 Serial port and Aux Audio connectors are not active in this version of software AN WARNING To avoid the risk of electrical shock any line powered peripheral equipment connected to this product must comply with UL IEC 60601 1 OR comply with UL or IEC and ISO safety standards for such equipment AND a be operated from an isolating transformer complying with UL IEC 6061 1 OR b be kept at least 6 feet 1 8 m from the patient 19 Verifit User s Guide Version 3 12 May 2015 3 General Operation This section describes the use of the built in keypad a QWERTY keyboard not included or a computer mouse to control the Verifit and enter data It also describes the use of an optional barcode scanner to enter data from printouts produced by Audioscan analyzers and provides instructions for updating the Verifit operating software Input device operation The Verifit may be operated by means of the built in keypad an external mouse or an external QWERTY keyboard These devices are used to summon on screen menus and select items from them to operate on screen buttons and to input data The scroll wheel on this type of mouse will scroll through long lists in list boxes and in Help Clicking the right mouse button generates an image of the keypad which may be operated by the mouse Clicking the left mouse button when the mouse pointer is on
185. rifit User s Guide Version 3 12 May 2015 Hawkins D B Walden B E Montgomery A A amp Prosek R A 1987 Description and validation of an LDL procedure designed to select SSPL90 Ear and Hearing 8 162 169 Killion M C amp Monser E L 1980 Corfig Coupler response for flat insertion gain In G A Studebaker and I Hochberg Eds Acoustical Factors Affecting Hearing Aid Performance Baltimore University Park Press Lewis D E Feigin J A Karasek A E amp Stelmachowicz P G 1991 Evaluation and assessment of FM systems Ear and Hearing 12 268 280 Martin H C Munro K J amp Langer D H 1997 Real ear to coupler differences in children with grommets British Journal of Audiology 31 63 69 Moodie K S 1996 A practical approach to hearing aid selection BSA News 18 6 8 Moodie K S Seewald R C amp Sinclair S T 1994 Procedure for predicting real ear hearing aid performance in young children American Journal of Audiology 3 1 23 31 Moore BrianC J amp Glasberg Brian R 2004 A revised model of loudness perception applied to cochlear hearing loss HearingResearch 188 2004 70 88 Mueller H G amp Bright K E 1994 Selection and verification of maximum output In Valente M ed Strategies for Selecting and Verifying Hearing Aid Fittings New York Thieme Medical Publishers 38 63 Pavlovic C V 1991 Speech recognition and five articulation indexes Hearin
186. robe module may lead to damage or alteration of the factory calibration 3 DO keep the probe module and probe tubes in a clean area 4 DO stow the probe module when not in use or when transporting the Verifit 16 Verifit User s Guide Version 3 12 May 2015 Battery pill use and care The thin connecting strip of each battery pill is fragile When inserting pills into hearing instrument battery compartments take care that this strip is not pinched or bent severely as the battery door is closed 1 Select a battery pill that is appropriately sized for the hearing instrument that you are testing 2 Insert the pill into the hearing instrument carefully closing the battery door over the thin connecting strip 3 Plug the pill s cable into the battery pill jack inside the Verifit test box to the right of the coupler microphone connection 4 Turn the hearing instrument on REFERENCE COUPLER BATTERY MIC MIC PILL Mouse keyboard barcode scanner The Verifit may be operated from the built in keypad a mouse or a standard computer QWERTY keyboard which may also be used to enter headers and comments on printouts A USB mouse or keyboard may be plugged directly into any of the USB ports provided See Input device operation Verifits with serial numbers below 4671 also have connectors for a PS2 mouse and keyboard 17 Verifit User s Guide Version 3 12 May 2015 An optional barcode scanner may be connected to
187. rs to the unnatural sound of one s own voice that results from occluding the external ear It is the result of the high SPL produced at the back of the throat during a closed vowel utterance coupling to the closed ear canal via bone conduction Ear canal levels in a closed ear canal can exceed 90 dB SPL for closed vowels such as ee The effect is greatest below 1000 Hz Clients with mild moderate low frequency hearing loss may describe their own voice as sounding hollow or as if they were talking in a barrel The occlusion effect is measured by comparing the SPL in the ear canal to that outside the external ear while the client vocalizes ee with the hearing aid in place and turned off Differences greater than 10 dB may result in complaints This occlusion effect measurement is useful in quantifying the extent to which venting or deep insertion is addressing the underlying cause of the complaint Occlusion effect measurement 1 D n RB pW 7 Refer to On Ear Measures Setup to prepare the system for use and for proper positioning of the client and the probe tube Insert the earmold or custom hearing instrument into the ear being careful not to advance the probe tube further into the ear canal A lubricant applied to the earmold or custom instrument shell in the vicinity of the probe tube will make insertion easier and prevent slit leaks around the tube Turn the hearing aid OFF Press Tests then highlight and lt PICK gt On ea
188. rve targets and compression threshold targets are not provided Such steady state parameters 92 Verifit User s Guide Version 3 12 May 2015 are of little value in estimating amplified speech levels Matching amplified speech to the LTASS targets at levels from 50 to 75 dB SPL provides much better assurance that fitting goals are being met 4 There is no requirement to input client gender The impact of gender on REAR targets is less than 1dB 5 There is no requirement to input hearing aid experience An Experienced user is assumed The reduction in NAL NL2 REAR targets for an inexperienced user is less than 4 5 dB 6 There is no provision to generate targets for tonal languages The REAR targets for tonal language differ less than 2 5 dB from those for non tonal languages 7 There is no requirement to input the number of compression channels This may be useful when the signal used for verification is not the signal for which the targets were developed It is irrelevant when using real speech signals to match speech targets and when using narrow band signals to match narrow band maximum output targets 8 There is no requirement to input compression speed It has no impact on REAR targets 9 There is no requirement to input earmold tubing type It has no impact on REAR targets 10 There is no requirement to input vent size or fitting depth They have no impact on REAR targets 11 For sound field threshold the speaker is as
189. rves of coupler SPL vs input SPL at 25 5 1 2 and 4 KHz Telecoil Tests for telephone sensitivity and test loop sensitivity using a telephone magnetic field simulator TMFS and a large coil in the test chamber floor ANSI S3 22 1996 facts The Verifit performs selected hearing instrument tests in accordance with ANSI S3 22 1996 This standard expresses some outputs and gains as High Frequency Average HFA values The HFA is the average of values at 1000 1600 and 2500 Hz If a hearing aid meets certain conditions the manufacturer may choose other averaging frequencies called Special Purpose Average SPA frequencies The current averaging frequencies are indicated explicitly on test results where space permits and also appear as tick marks on the frequency axis of graphs To change the averaging frequencies see ANSI test frequencies This standard also requires some tests with the gain control full on and some with the gain control in the Reference Test Position RTP This requirement applies to both Linear and AGC aids that have a HFA or SPA full on gain greater than the HFA or SPA OSPL90 minus 77 dB Otherwise the RTP is full on If required the Verifit will pause in its testing and guide you in setting the gain control to the RTP All other controls on the hearing instrument should be set to provide the widest frequency response the greatest gain and the highest maximum output AGC controls and or programmable parameters should be se
190. s To hide or show test curve s 1 Highlight then lt PICK gt Curve Hide Show 71 Verifit User s Guide Version 3 12 May 2015 Curve display mu Testi Show Show Test2 Hide Hide Tests Hide Hide Testa Hide Hide Unaided 65 Hide LI Curve display Ear Left REAR1 Show REAR2 Hide REARS Hide REUG Show 2 Highlight then lt PICK gt the desired test to toggle between the Hide or Show options The curve will toggle on or off when selected The envelope of speech curves in Speechmap may be displayed or hidden for clarity of display by toggling the buttons under the m column Note that you may set the envelope to automatically hide whenever a new test is run see Speechmap Speechmap Setup 3 Press Continue to return to the test screen Hiding a curve does not erase it To erase curves use the Session key 72 Verifit User s Guide Version 3 12 May 2015 14 On Ear Instrument Measures A number of the tests covered in Test box measures can also be performed with the hearing instrument coupled to the ear of a client rather than to a 2cc coupler The on ear results may be expected to differ from the test box results because of the different acoustic environment and the different acoustic load On ear directional test overview Directional characteristics such as polar plots and Directivity Index DI are typically meas
191. s Move the on ear speaker s internal or external and client away from walls and hard objects Move the client closer to the speaker s The speaker or connecting cable external speakers only is defective If this is the case you should not hear any sound coming from the internal or external speaker s during any test Try a different speaker or cable Barcode scanner malfunction If there is no red scanning beam when the trigger is pulled tug on the cable where it enters the scanner If it comes loose easily push it back in until it clicks in place 126 Verifit User s Guide Version 3 12 May 2015 If the scanning beam stays on when the trigger is released or if the barcode scanner fails to read known good barcodes try the following 1 Unplug the scanner from the equipment then reconnect it If the problem persists 2 Print this page on an external printer see External display printer speaker or from the electronic user s guide see Electronic user s guide 3 If your barcode scanner has a PSC logo scan these two barcodes starting with the top one This will reset the scanner to its default settings If your scanner has a Unitech logo scan the following barcode to reset the scanner to its default settings 127 Verifit User s Guide Version 3 12 May 2015 128 Verifit User s Guide Version 3 12 May 2015 23 Tech n ical Test Stimuli tone tone burst pink noise
192. s and instructions for accessing the electronic User s Guide Note that the User s Guide may be viewed on the Verifit at any time by pressing Help For long Help pages use lt Left Right gt or mouse to switch between the Help index and the Help page and arrows or mouse to scroll through the page New in this software release Software 3 12 introduces the following significant additions and changes 1 NAL NL2 prescription formula For details see 17 NAL NL2 in Speechmap 2 User supplied test signals For details see 17 Using custom stimuli in Speechmap 3 Inductive stimulus in Speechmap for adjusting tcoils for use with room loops For details see 18 T Loop fitting and verification in Speechmap 4 New Directional Test works with feedback cancelers and frequency lowering devices 5 Improved audioscan updater USB memory sticks left plugged in will not interfere with startup Product description The Verifit is a hearing aid analyzer intended to be used by hearing care professionals such as audiologists and hearing aid specialists to verify the electro acoustic performance of a hearing aid connected to a standard earphone coupler or while worn on the ear of the end user It consists of a an acoustically treated test chamber which houses a battery substitute 1 3 volt supply 2 loudspeakers a reference microphone for controlling the signal from the loudspeakers a standardized earphone coupler connected to a measuri
193. spectrum is from Cornelisse et al 1991 adjusted to a 1 m reference 1 3 octave band SPL Add to band SPL for Speech ICRA Pink j 4 Own FM FM Hz Standard ISTS Female Child Noise Noise Voice Chest Boom 200 56 8 57 0 54 9 32 3 52 9 53 2 2 5 9 0 19 2 250 56 0 57 0 53 1 51 5 55 9 53 3 3 10 7 12 0 22 2 315 53 0 53 8 48 4 57 3 56 9 53 9 6 11 0 16 6 26 0 400 57 0 57 4 55 8 54 1 57 5 53 6 1 10 0 13 3 22 8 500 58 0 57 4 57 3 53 2 57 8 53 7 7 10 1 13 2 25 3 630 55 0 56 4 58 1 61 2 54 3 53 12 4 10 5 21 0 29 1 800 52 5 53 7 54 6 56 5 52 8 53 14 4 10 8 26 4 32 1 1000 51 0 50 0 52 0 52 7 50 4 53 15 0 10 5 26 4 32 7 1250 50 5 48 0 51 0 45 4 51 3 53 14 8 5 5 22 0 33 6 1600 48 0 47 4 51 1 41 1 48 5 53 15 5 4 0 22 1 33 9 2000 45 0 44 9 51 2 39 7 47 0 53 16 2 6 0 21 0 33 0 2500 44 0 42 8 49 3 35 5 44 7 53 14 8 6 0 18 2 31 9 3150 42 5 42 7 46 0 28 8 43 3 53 14 5 2 0 14 4 30 4 4000 42 0 41 0 40 0 31 2 41 1 53 13 2 0 5 11 8 29 0 5000 40 0 40 3 36 1 30 6 39 6 53 9 2 1 0 12 4 27 8 6300 41 5 41 3 43 5 32 6 33 5 53 4 2 0 0 11 4 26 2 8000 41 5 40 4 39 9 35 2 28 2 53 2 7 4 0 11 0 25 8 Overall 65 0 65 0 65 0 65 0 65 0 65 75 0 75 0 84 0 93 0 Microphone location effects Microphone Location Effects Add to all stimuli in test box mode Frequency BTE 200 0 0 250 0 3 315 0 7 400 0 2 500 0 1 630 1 7 800 2 0 1000 2 2 1250 0 3 ITE 0 0 1 0 1 3 0 8 0 8 0 3 0 6 1 1 0 6 Heari
194. ssumes a the unaided threshold is a sound field threshold and b a linear aid i e REIG doesn t depend on level The REUR curve uses the right hand SPL scale and is shown for reference only Insertion gain audioscan 30 2 Instrument BTE Y 20 amp Presentation Single view Li Format Graph v gc l l i l Scale dB HL j 0 VP xxxn mmm PT EIE E UIRIBDIUCLULD CI II 55 T Target Estimated Speech Audiometry Aided Aided aiii pa Threshold Threshold intelligibility Transducer Headphone ai l l ERES gt MN Index SII T REUR Average 30 xS m d Hur E REAR 401 E a i R pa us Eu REIG Stimulus Level SII p Speech Regon 5 0o o o0 504 Q7odBSPL 1 Pink noise 55 76 AA E rin Iiii iian iI RIRI n nnn ununi 2 a an L 70 i dv n ru Unaided Threshold Fitting method REUR Pinknoise 55 38 80 NAL RP F 76 90 Hide Show 100 SII for target Aided Threshold 110 120 MaxTM SPL 120 a LL CET 250 500 1000 2000 4000 8000 Audiometric data entry Threshold data and parameters may be entered by scanning a barcode on a previous Audioscan printout or manually using a mouse the keypad or the numeric keypad on an external keyboard See Mouse keyboard 86 Verifit User s Guide Version 3 12 May 2015 barcode scanner and Input device operation To enter data from a barcode see Barcode data input and 1 Pr
195. sumed to be at 45 degrees For on ear measurements the speaker is assumed to be at 0 degrees and the reference microphone is assumed to be on the head surface 12 The SII calculation is per ANSI S3 5 1997 and is the same for all fitting methods Camfit in Speechmap Camfit is an approach to fitting hearing aids developed by Brian Moore at the University of Cambridge UK It specifies the level dependent gain required to correct abnormal loudness as modelled by his cochlear hearing loss simulation It provides two approaches to correcting for the hearing loss Camfit restoration aims to amplify sounds that are soft comfortable and loud for a person with normal hearing so that they are soft comfortable and loud for a hearing aid wearer This is the stated goal of the IHAFF International Hearing Aid Fitting Forum fitting method Camfit equalisation aims to amplify speech to produce the same loudness in each critical band It has been argued that this is likely to give the highest intelligibility for a given overall loudness This is the rationale behind the NAL fitting methods and will generally produce similar targets Using Speechmap The Speechmap fitting environment provides a number of distinctly different stimuli Speech and noise are analyzed in 1 3 octave bands and for most speech stimuli data are presented as 3 curves The top curve is the level exceeded 196 of the time speech peaks the lower curve is the level exceeded 7096 of the t
196. sure ofthe functioning of the directional features of hearing aids that is indepen dent of compression or noise reduction algorithms unlike other methods that sequentially measure re sponse from different directions and work only with these features disabled REM Directional Single view Front signal Back signal TUN Presentation Single view ii Format Graph F Scale dE SPI REAR Stimulus Level Spkr Ajo 2 Q Dual naise 70 F Dual noise 70 H 3 9 aoi fide Show T6 1 Adaptive Directional 5 instrument 20 seconds after signal applied rd Curve 250 S00 T0200 2 2 3 Real speech signals Real speech signals are provided in Speechmap for both On ear and Test box measurement modes Four different digitized speech passages 2 male 1 female and 1 child are provided as well as the International Speech Test Signal ISTS and the single talker In ternational Collegium of Rehabilitative Audiology ICRA distorted speech signal In addition one of the speech passages has been filtered to provide 3 varia tions for evaluating frequency lowering hearing aids Each has a duration of 10 15 seconds and may be presented as a single passage or in a continuous loop In order to provide a repeatable speech signal to the device under test the signal path must be equalized prior to the presentation of the speech signal This is accomplished by presenting a 896 ms pink noise burst at the selecte
197. surement MM 79 Calibration of RECD transducer ote eti entr iere e entr t Pe He ER Re a e ege lo HERREN Ped apte ESE E EiS 79 Measure RECD POSUERIT HEREIN EEA AE EE AE s ED e ei E IE 80 RECD EWIE M M 81 PINS TES SAGO OUD REC se 82 lisi in D sate 82 RECD PACU PEE 84 Wig Se ret Dep 85 Dicen gain MINS d E 85 Insertion samman Ello see rere eerte i Er E Rot Ge PES Pe ette a eR b Ra to Ca eb ERR cotes dito 86 Awdiometric data DR PETENTE Em 86 REUR m asurement etae C 87 REAR measurement Drocedute uiia pto et SEDE ERROR He EC DER A EE NEEG XE RE EE Ede Eg E 88 SIL calculation 11 Insertion Bl ee ttr et iter e t e a S DR GERE E Fer eie Da Lee ep EE Se i nents 89 CROS Btt ng usine IuserDon ave cs ecce en eeo tues iana eE ea E Hot ERE Tat reped Deren RSEN E RE RU ERES 89 SPCCCWMAP ee 91 Speechinap FACES saes ae Met pep esd Wed vt ta Seales Perotti VR ec Dee tes eoe LUUD cael exe rape eua ad 9 DSE SU ee CANAD asserts tret er ett eet HR e n RHEIN tapete ee EE He HORA ERES RU Eon 91 DSL SIE RC P R 92 NALNL an Speeelimap i diet rene t ro cs scan per PI e eder e po te t E E
198. t 8 Highlight and lt PICK gt Daily or Weekly to toggle the measurement interval for the coupler response 79 Verifit User s Guide Version 3 12 May 2015 Measure RECD Connect the RECD transducer to the RECD jack on the front of the test chamber Prepare the system for on ear tests See Calibration of on ear probe microphone RECD transducer foam tip 1 Press lt Tests gt then highlight and lt PICK gt On ear measures then highlight and lt PICK gt RECD 80 Verifit User s Guide Version 3 12 May 2015 T Select the RECD coupling method that will be used on the ear Audioscan software supports both foam eartips and personal earmold however this choice must be made prior to measurement If no RECD calibration exists or the measurement interval has been exceeded go to 15 3 Calibration of RECD coupler If a valid transducer calibration exists highlight and lt PICK gt Measure real ear Refer to Positioning the probe tube and insert the probe tube into the ear canal to within 2 5 mm of the eardrum Insert the foam tip into the ear being careful not to advance the probe tube further into the ear canal Foam tip insertion depth should be as used with insert phones Allow the foam tip to fully expand in the ear Press lt Continue gt to generate the real ear response curve pink and the RECD curve cyan If the RECD curve is negative and unstable in the low frequencies check the seal o
199. t 1 12th octave A weighted or C weighted from the drop down list For 1 12th octave filter highlight and PICK the Frequency window then highlight and lt PICK gt the desired frequency from the drop down list Highlight and lt PICK gt Start test to start the test Start test changes to Stop Test To stop the measurement highlight and lt PICK gt Stop test You may change Level and Frequency without stopping the test NOTE Microphone extension cables VA 131 amp VA 133 are available from Audioscan Standard audio extension cables should not be used They will substantially increase noise levels 60 Verifit User s Guide Version 3 12 May 2015 Level 75 iv dB Frequency 450 Hz Starttest Distortion 15 0 x Se Sa a eas a 0 10 20 30 40 50 60 70 80 90 100 Coupler microphone 102 5 dB ee aR PL FR DL 0 10 20 30 40 50 60 70 80 90 100110120130 Reference microphone 75 0 dB S SISSE SITES ee 0 10 20 30 40 50 60 70 80 30 100110120130 Gain 27 5 dB Tog Ton To o FT To n Tn T T rn n td 0 10 20 30 40 50 60 70 80 90 100 61 Verifit User s Guide Version 3 12 May 2015 11 Sensory loss simulator Sensory loss simulator description A pure conductive loss attenuates loud and soft sounds equally and is easily simulated by just turning down the volume or inserting an earplug Losses of a sensory nature are more complex and more difficult to simulate
200. t as designated by the manufacturer At full on gain the Linear and AGC test sequences provide a curve of OSPL90 Output Sound Pressure Level for a 90 dB input SPL the HFA or SPA and peak value of this curve the frequency of the peak and the HFA or SPA gain for a 50 dB input SPL With the gain control at RTP these sequences also provide a frequency response curve with an input SPL of 60 dB Linear or 50 dB AGC the HFA or SPA gain for a 60 dB input SPL the frequency range battery drain equivalent input noise harmonic distortion attack and release time AGC only ANSI S3 22 2003 facts ANSI 83 22 2003 has been designated a recognized standard by the FDA and is mandatory for reporting test data The most significant change from the 1996 version is the requirement for the hearing aid to be set in its most linear mode for the setting of the gain control to Reference Test Setting changed from Reference Test Position and for all tests except attack and release and input output I O curves These two tests are to be conducted with the AGC function set for maximum effect The AGC test sequence will pause to allow AGC to be set prior to measuring attack and release time Full on gain is determined with 50 dB input SPL 60 dB was formerly an option and frequency response curves are run at 60 dB SPL for Linear and AGC aids 45 Verifit User s Guide Version 3 12 May 2015 The OSPL90 curve the HFA or SPA and peak v
201. t has equal en ergy per octave producing a flat spectrum when ana lyzed in 1 12 or 1 3 octave bands Figure 1 shows the 1 3 octave spectrum of the pink noise signal and the noise signal specified in ANSI S3 42 1997 Note that the ANSI S3 42 1997 spectrum represents speech peaks not the long term average 1 3 OCTAVE SPECTRA for the PINK NOISE SIGNAL and ANSI 3 42 NOISE re overall SPL 9 00 10 00 11 00 12 00 13 00 BAND SPL dB re overall SPL 16 00 17 00 18 00 200 250 315 400 500 630 4 Band Level re overal SPL Pink Noise Band Level re overall SPL ANSI 83 42 800 1000 1250 1600 2000 2500 3150 4000 5000 6300 8000 BAND CENTER FREQUENCY Hz Figure 1 1 3 octave spectra for the pink noise signal and the noise signal specified in ANSI 3 42 1997 2 2 2 Dual direction pink noise signal Verifit only This unique test signal is available in the dual source Verifit test chamber and for on ear measurements by adding an additional sound field speaker It is similar to the pink noise signal described previously except that the component tones are presented simultane ously from two speakers half from each The spec trum of the tone complex from each speaker is in dependently controlled with 1 12 octave resolution at the reference microphone Two simultaneous re sponse curves one for each speaker are derived from the measured output of the hearing aid This provides a real time mea
202. te the integration time of the ear Although this varies with frequency and individuals a value between 100 200 ms is likely The Verifit and RM500SL use a 128 ms analysis time period as an ap proximation because it also has considerable historic support Because the spectrum of a speech signal varies with time it is necessary to average measurements over several seconds to obtain a stable repeatable result However the effects of adjustments to hearing aid pa rameters need to be seen quickly in order to be useful for optimization To resolve these conflicting needs speech signals are first presented in a repeating loop with a sound field equalization test prior to the start of each passage A running calculation of the short term speech envelope and average is performed on 2 3 seconds worth of data and is displayed in real time so that the effects of adjustments to hearing aid parameters are easily viewed Pressing the Continue key causes the passage to restart and run in its entire ty The envelope and average are calculated over the full passage to provide stable and repeatable data When using live speech as a test signal a Freeze curve function is available to capture the short term spectra for examination and counseling purposes 55th Percentile L1 30th Percentile L70 00 1000 Figure 9 Example of speech envelope and LTASS Fei instrument BTE O Mode REM JO Presentation Single vi
203. that of a child s ear Each of these sound sources will produce a different RECD and if the acoustic impedance of the sound source differs for the ear canal and 2cc coupler measurements further RECD differences will result Audioscan uses the HA 2 BTE coupler for the transducer calibration then our RECD transducer and either a foam eartip or the client s personal earmold for the real ear measurement When a foam tip is used we subtract the two measurements to get an HA 1 RECD When an earmold is used on the ear measurement we first subtract an average earmold referenced to our RECD transducer to obtain an HA 1 RECD then we add the same average earmold referenced to an ER3A to obtain an HA 2 RECD with earmold effects retained When the entered HL transducer is Insert foam we apply an HA 1 foam tip RECD during the HL to SPL transform to correct the thresholds measured in a non average ear canal When the HL transducer is Insert 4 Mold we apply the HA 2 referenced RECD with earmold effects retained to the HL to SPL transform In Test box Speechmap simulated REM we apply the HA 1 RECD to the coupler measurment for ITE ITC CIC RIC instruments and also to BTE instruments when BTE mold has been selected and personal earmold used in the measurement When the instrument type is set to BTE HA 2 the HA 2 referenced RECD is applied RECD values and are stored displayed and printed referenced to the HA 1 coupler Imported data from softw
204. the measurement in the test box Measured RECD is appropriate for coupler simulation and HL threshold correction and error is minimized Alternate method 1 RECD On ear measurement Audioscan RECD transducer client s personal earmold Test box Speechmap coupling HA 2 BTE coupler This method utilizes the client s personal earmold for the on ear RECD measurement The HA 1 RECD is converted to HA 2 reference with earmold effects retained and is applied in Testbox Speechmap The error introduced is the difference between the earmold effects when connected to the hearing instrument receiver and earmold effects when connected to the RECD transducer If the total earmold tubing length is less than 35mm it is recommended that Foam tip be selected in the RECD Coupling field This will bypass the correction and increase accuracy for small earmolds Alternate method 2 RECD On ear measurement Audioscan RECD transducer foam eartip Test box Speechmap coupling HA 2 BTE coupler Since the RECD here is measured with a foam eartip an average earmold is added to obtain an HA 2 RECD with earmold effects The error involved will be the difference between the actual earmold and the average used Alternate method 3 RECD On ear measurement Audioscan RECD transducer client s personal earmold 83 Verifit User s Guide Version 3 12 May 2015 Test box Speechmap coupling client s personal earmold HA 1 ITE coupler An average earmold w
205. the selected printer is displayed 12 Press Continue to exit page setup and Continue to exit Setup 32 Verifit User s Guide Version 3 12 May 2015 Local printer setup 1 Connect an external printer to a USB port on the rear connector panel Only PCL 3 not PCL3GUI PCL 5 PostScript compatible printers are supported as well as HP Laserjet Pro 1660 and Deskjet models 3050 1000 D2680 D4160 6940 and 460 e Failure to follow operating instructions could place the user or operator at risk Press Setup then highlight and lt PICK gt Printing Highlight amp PICK USB Highlight amp PICK Printer details automatic if printer type is set to None Highlight amp PICK Printer type gv Wed p cB Highlight amp lt PICK gt your printer type Select HP Deskjet Color 1 for a printer with a single ink cartridge None HP Deskjet Color 1 HP Deskjet Color 2 HP Laserjet Black PostScript Other HP HP Deskjet Color 2 for a printer with separate color and black ink cartridges HP Laserjet Black Check Black only for black printouts on a color printer Select Other HP for a list of supported specific printer models and press lt Continue gt 7 If Other HP was selected pressing lt Continue gt summons the HP printer selection menu Select a Printer model from the drop down list and press lt Continue gt 8 Press lt Continue gt to exit Setup
206. to delete the point On the keypad use the arrow keys to change frequency and level and press lt PICK gt to enter or delete a threshold point 4 Press Continue when all points have been entered See Audiometric data entry or Assessment data entry for more details 5 Highlight and lt PICK gt Start test Sound processed to simulate the entered hearing loss will be presented via the sound field speaker 6 Highlight and lt PICK gt Stimulus then highlight and lt PICK gt a sound to play 7 Highlight and lt PICK gt Hearing then highlight and lt PICK gt from Normal 1 2 Entered loss Entered loss 8 Highlight and lt PICK gt Type of loss to toggle between Sensorineural and Conductive hearing loss simulations 9 Highlight and lt PICK gt Cancel to stop the simulation 62 Verifit User s Guide Version 3 12 May 2015 12 On Ear Measures Setup For accurate repeatable measurements the Verifit must be properly set up and calibrated the client must be properly positioned and the probe tube must be properly positioned in the ear canal Some common terms Real Ear Unaided Response REUR SPL or band SPL in the open unaided ear canal for a given stimulus Real Ear Unaided Gain REUG Difference in dB between the REUR and the stimulus SPL or stimulus band SPL Real Ear Aided Response REAR SPL or band SPL in the ear canal for a given stimulus with a working hearing aid in place R
207. tore features saves this database in xml format which may be viewed with a web browser or imported into an Excel spreadsheet or returned to the Verifit to recreate the session The data is saved in a file which you can name using a connected computer keyboard This name the Client ID may not contain amp lt A number is automatically appended to the name you enter and this number is incremented each time you add a session to this Client ID e g Andy 1 xml Andy 2 xml Andy 3 xml If you do not enter a name the file will be named session xml e g session 1 xml session 2 xml session 3 xml NOTE that Client IDs starting with numbers appear at the top of the list followed by those that start with upper case letters while those starting with lower case letters will be at the bottom of the list It is recommended that you use a consistent system when creating Client IDs such as all upper case letters to avoid duplicate entries If the Client ID links the data to an individual the printout becomes ePHI electronic Protected Health Information which must be protected under the HIPAA Security Rule To store session data to a file 1 Press the Session key then highlight and lt PICK gt the top list button on the Session data poster 2 Highlight and PICK Store session to file from the list 3 Highlight and lt PICK gt the Client ID list button This will display a list of Client IDs with the first entry hi
208. tr PO P rre a bep deo REM ero EHE CES ena 125 Inyalid test box calibration ae Eee DO qi HER E S ETE TUS 125 ING Ofer feb mic detebfed u ieu ee rep entend aE OP ORDRE A ide dote vue peat Stans Ee Rose pu e aa 125 Invalid tcar calibration BERE RE 126 soundshield speaker oVerdEIVel cossirier ai e rh I ere pei mv ive e eR PU dr Era ee ERE BERE EP R 126 Barcode scanner qnalPutction s eec Fiet tr rr tr errore ite t endo ei ep Feed Peas Fe EEEREN E ENEA ES n ea 126 23 Technical Speci Cans C 129 ELEC C 132 PM RETCTON A M 137 26 Appendix C 140 Manufacturer Disclosure Statement for Medical Device Security eese eterne erste teen de enn etant enn 140 PUE ViIconi dH H 143 AudioNote 2 1 VERIFIT and RM500SL Test Signals and Analysis esses eene nne nnne nnne 143 Verifit User s Guide Version 3 12 May 2015 1 About Verifit This section provides a listing of features new in this software release describes the Audioscan Verifit provides contact warranty and trademark information safety warnings and notice
209. ttery PUM SS ead Abe soe eie tcer etr red erre te ete E E Pere HT Dre Truco ted Ue pua epe ERU Ub etr des 17 Mouse keyboard barcode SCA ieu een erret ere ehe ede peer pere e Ee Pee uM geebae tay edo Eae pa A ere aee rebua Peces a 17 Monitor headphotries rettet ettet eere bbb eC RE PRORSUS ERIT SE Ree TE RENTE R duels aee ERR e FEE PENES EROR EUIS E RR 18 Extermiall peripheral ae 18 D General Operaio A a cas 20 Inp t device opera m e n E E A EEA E R RS 20 Barcode Catal MPi sssri aene reae E n OE aE E AA EESE ATEA ES EE ESSA EAEEREN EEEa 20 UNT D Q 21 Metus lists and DUO eer ee EEE E EE EE ENEE sioe aped nte iue e pn Eee PEN EEE SENA RB y CES uos 22 Screen messages and Help C 22 Software pO c ener tesoro Do i E ti re UU Qe dete aa es a rE A R Gus E A EER 23 4 General 5 UU E 24 Date and Hime SEU M 24 Display Se MiNoS o e535 fate vests reete er ETE veeteadecvaveces ERR UE IE IPod a rr E IS ISO duoc DEREN TI TT TER NET E 24 Savine test Up P 24 xal UT E 26 Networking Te QUITEIMENIS P H 26 MMS yy OTe S EEDE a sed eode ee eI UU E uersu eed tee dE 26 NOAH Service POTE T
210. ty requirements of IEC 60601 1 for type BF isolated floating applied parts Environmental safety K This symbol on the product means that this product is not to be disposed of in unsorted municipal waste a because electrical and electronic waste may contain hazardous substances which could endanger the environment and human health This product and its associated items must be disposed of in accordance with local disposal regulations for electrical and electronic waste Consult your local waste disposal authority regarding applicable regulations The microphone probe tubes and the foam eartips used with the RECD transducer are for single patient use After use they may be disposed of in unsorted municipal waste or as required by your facility s waste management policy Declaration of Electromagnetic Compatibility EMC Medical electrical equipment needs special precautions regarding EMC and needs to be installed and put into service according to the following information e The Verifit should not be used adjacent to or stacked on other equipment If this is necessary its operation should be verified as normal in this configuration e Portable and mobile RF communications equipment can affect medical electrical equipment and may affect the performance of the Verifit e Performance degradation due to electromagnetic disturbances including electrostatic discharge is considered normal and acceptable The comp
211. ty used with the HA 1 coupler to ensure cleanliness Both couplers and coupler mic can be wiped down with alcohol wipes as needed Ensure that all safety and usage recommendations on cleaning product packages are followed Microphone care Coupler microphone 1 DO NOT twist the cable when attaching a coupler to the coupler microphone Turn only the coupler or unplug the coupler microphone before turning it 2 DO NOT leave the coupler microphone plugged in when transporting 3 DO make sure that the 2cc coupler is tightly screwed to the coupler microphone when performing hearing instrument tests Coupler leakage can cause feedback and erratic response curves 4 DO make sure the tubing on the BTE HA 2 coupler is free from any cracks tears 5 DO make sure that any replacement tubing used on the BTE coupler is either obtained from Audioscan or is 13 heavy wall earmold tubing exactly 10 mm in length Probe microphone Debris can alter the probe module reference microphone calibration and frequency response and can permanently clog the probe module port 1 DO NOT reuse probe tubes Probe tubes can be wiped with alcohol wipes for re use with the same patient but must not be used with multiple patients Attempts at ultrasonic cleaning usually result in cerumen becoming lodged in the lateral end which causes irreparable damage to the probe microphones 2 DO NOT attempt to open or repair the probe microphone Attempting to repair the p
212. type of data and the ear left right or left right is shown below the barcode Only data for the displayed ear are imported data for both ears in dual view Barcodes may be scanned in any order and it does not matter if the barcode is upside down 1 Select Speechmap Viewport or Insertion gain from the Tests menu 20 Verifit User s Guide Version 3 12 May 2015 2 Hold the printout so that the barcode is flat With the scanner 6 8 in 15 20 cm from the barcode press the trigger on the scanner and center the illuminated red line along the length of the barcode 3 When the scan is successful the scanner will beep the red line will extinguish and a Barcode Entry poster will appear on the screen A green checkmark on the poster shows which data have been accepted A message will advise if the barcode does not contain data for the screen you are viewing 4 When all desired data have been accepted select Done to apply the data See Barcodes tabular data headers and comments on printouts under Printing and Storing Results Keypad keys Keypad Button Help Setup Tests Session lt Left Right gt lt Print gt o s Arrows Round Key lt PICK gt key lt Continue gt lt Cancel gt Function Summon context sensitive Help Screen Summon Setup Menu containing a list of Verifit features that can be modified Any modifications made will be maintained after power o
213. uency without stopping the test Sound level meter using on ear microphones The manual control feature enables the Verifit to be used as a sound level meter to perform C weighted A weighted or 1 12th octave analysis of sound as measured by the probe and reference microphones A and C weighted measurements are limited to frequencies above 100 Hz and the averaging time and update rate are 384 ms 1 Refer to On Ear Measures Setup to prepare the system for use and for proper positioning of the client and the probe tube 76 Verifit User s Guide Version 3 12 May 2015 Press Tests then highlight and PICK On ear measures then highlight and PICK Manual control Highlight and lt PICK gt the Level window then highlight and lt PICK gt 0 dB stimulus level from the drop down list Highlight and lt PICK gt the Filter window then highlight and lt PICK gt 1 12th octave A weighted or C weighted from the drop down list For 1 12th octave filter highlight and lt PICK gt the Frequency window then highlight and lt PICK gt the desired frequency from the drop down list Highlight and PICK Start test to start the test Start test changes to Stop Test To stop the measurement highlight and lt PICK gt Stop test You may change Level and Frequency without stopping the test LE Verifit User s Guide Version 3 12 May 2015 15 Occlusion Effect Test The occlusion effect refe
214. ults are not expected to agree with data taken in large anechoic chambers Due to strong reflected signals measurements made in small reverberant rooms will show small separation between front and back response curves just as the benefits of directional technology will become less apparent in similar situations When performed in a sound booth or large acoustically dead room this test can be used to demonstrate and verify directional benefit and to provide assurance that the directional microphone array has been correctly assembled and programmed and has not deteriorated due to element drift or the clogging of ports On ear directional testing Best results are obtained using external front and rear sound field speakers positioned well away from reflective surfaces See External sound field speaker setup Refer to On Ear Measures Setup to prepare the system for use and for proper positioning of the client and the probe tube 1 Insert the earmold or custom hearing instrument into the ear being careful not to advance the probe tube further into the ear canal A lubricant applied in the vicinity of the probe tube will ease insertion and prevent slit leaks 2 Press Tests then highlight and lt PICK gt On ear measures then highlight and lt PICK gt Directional 3 Highlight and lt PICK gt Test 1 2 3 or 4 Two real time curves appear on the screen the heavier one is the response to the front speaker signal and the lighter one the
215. ured in a large anechoic chamber using sound from one direction and at one frequency at a time This means they apply only for a hearing aid set for linear amplification These are not conditions representative of real use The Verifit directional test measures directional performance in real time while using speech It is compatible with all forms of hearing aid processing including frequency lowering feedback compensation and other non linear algorithms The Verifit directional test presents speech at selectable levels from the front speaker and noise at a selectable signal to noise ratio from the rear speaker At periodic intervals the level of the speech and noise is momentarily reduced and an additional burst is played from either the front or rear speaker to measure the response from that direction This burst is extremely fast and will not influence the behavior of the hearing aid The coupler SPL is analyzed into two curves labeled F front and B back to indicate which speaker generated the curve The real time nature of the test allows the operation of adaptive directional systems to be readily visualized Optionally speech can be disabled which will cause the directional test to alternate noise bursts from the front and back speakers This test may not produce a directional response with all hearing aids Once directional performance is observed the test may be terminated Because this measurement is carried out in a real room res
216. use these methods of connection if your PC is not currently on any network i e the computer does not print to a network printer does not receive email and does not have Internet access Adding a second network connection to a Windows PC is complex and can have unexpected effects on the primary connection Automatic connection recommended Automatic connection requires a small 10 100 network router Most routers have DHCP address assignment active by default and do not require changes from the default Windows settings on the computer to establish a simple connection with a Verifit 3 Connect a Cat 5 RJ 45 cable from one router port to the Verifit network connector 4 Connect a second cable from a router port to the network connector on the PC 5 On the Verifit press Setup and then choose Network from the Setup menu 6 Select Enable Ensure the Auto checkbox is checked and choose Test A network address will be provided by the router and should show up in the Network address window By default Windows 7 computers have networking and DHCP enabled so at this point your connection should be complete If required to check your PC settings 1 Go to Control Panel Network and Sharing Center then select Change Adapter Settings on the left hand panel 2 Right click on Local Area Connection and choose Properties Ensure that Internet Protocol TCP IP or TCP IPv4 is checked Select this and select the Properties button
217. vered to the hearing instrument microphone is modified to include average microphone location effects for the hearing instrument type indicated The screen display for both modes is the same showing SPL measured or simulated in the ear canal For On ear mode press lt Tests gt then highlight and lt PICK gt On ear measures and highlight and lt PICK gt Speechmap Review On Ear Measures Setup For Test box mode press lt Tests gt then highlight and lt PICK gt Test box measures and highlight and lt PICK gt Speechmap Review Calibrating test box reference microphone Coupling the hearing instrument Positioning the hearing instrument To switch modes highlight and lt PICK gt Mode It is suggested that hearing instruments be preset in test box mode with fine tuning done in on ear mode Note that on ear mode should be used for vented or open fittings Vent effects depend on the vent the ear and 96 Verifit User s Guide Version 3 12 May 2015 the hearing aid settings and cannot be reliably predicted from 2cc coupler measurements SII calculation in Speechmap The Verifit calculates a Speech Intelligibility Index SII value in 96 for unaided speech at 65 dB SPL and for each aided test The calculations use the 1 3 octave band method of ANSI 83 5 1997 without the 160 Hz band and without masking effects with results expressed as a by multiplying by 100 Level distortion effects are included but no hearing loss dese
218. vg 65 100 fi Curve Hide Show 250 500 1000 2000 4000 8000 Example of user supplied files user wav 39 66 user 4 wav and user 42 5 wav 100 Verifit User s Guide Version 3 12 May 2015 19 Speechmap Fitting Procedures The Speechmap fitting screen provides a number of choices for inputing and applying audiometric data for the verification of hearing instrument fittings The procedures in this section assume a familiarity with Test Box Measures Setup On Ear Measures Setup On Ear Measures Screen Setup and Speechmap Assessment data entry Threshold data and parameters may be entered by scanning a barcode on a previous Audioscan printout or manually using a mouse the keypad or the numeric keypad on an external keyboard See Mouse keyboard barcode scanner and Input device operation To enter data from a barcode see Barcode data input and 1 2 Press the barcode trigger and center the red line on the barcode from a distance of 6 8 in 15 20 cm The scanner will beep and the Barcode Entry poster opens Highlight and lt PICK gt Done to accept the data indicated on the poster To enter assessment data manually 1 2 Highlight and lt PICK gt Audiometry Highlight and lt PICK gt an item to toggle its setting or generate a list box Age can be changed only if Targets DSL child See Assessment data choices 1 and Assessment
219. via a network connection e g LAN WAN VPN intranet Internet eS Yes_ Transmit receive ePHI via an integrated wireless connection e g WiFi Bluetooth infrared Yes 3 10 Other ADMINISTRATIVE SAFEGUARDS Yes No N A Note 5 Does manufacturer offer operator and technical support training or documentation on device security features Yes 4 6 What underlying operating system s including version number are used by the device custom build of Linux based on kernel 3 4 47 PHYSICAL SAFEGUARDS Yes No N A Note 7 Are all device components maintaining ePHI other than removable media physically secure i e cannot remove without tools _ Yes _ 8 Does the device have an integral data backup capability i e backup onto removable media such as tape disk cseceeesaeees No _ 9 Can the device boot from uncontrolled or removable media i e a source other than an internal drive or memory component _ Yes_ TECHNICAL SAFEGUARDS Yes No N A Note 10 Can software or hardware not authorized by the device manufacturer be installed on the device cssceseeeseseeseeeeees No _ 11 Can the device be serviced remotely i e maintenance activities performed by service person via network or remote connection _ No _ a Canthe device restrict remote access to specific devices or network locations e g specific IP addresses _ b c Level of owner operator service access to device
220. y pill use and care to prepare the instrument for testing 3 Turn the instrument ON set AGC controls or programming parameters as in ANSI 1996 Linear and AGC tests or ANSI 2003 Linear and AGC tests Highlight and lt PICK gt Curve 1 Test setup instructions will be displayed Press Continue to generate a set of 5 input output curves To measure another set of 5 input output curves highlight and lt PICK gt another Curve PO p x To summon a cursor to determine curve values position the mouse pointer on a graph area and click the left mouse button Click again to turn it off NOTE Noise in the test area may cause erroneous results at low input levels particularly at 250 and 500 Hz Ensure that the test box is well sealed and ambient noise is low ANSI telecoil terminology The Verifit test chamber contains an integrated telephone magnetic field simulator TMFS and a telecoil test loop meeting the requirements of ANSI 83 22 that enable the measurement of coupler SPL produced by a hearing instrument with a telephone pickup coil ANSI uses the following terms in telecoil testing RTG reference test gain is the average gain measured with the gain control in the reference test position 1996 or reference test setting 2003 See ANSI S3 22 1996 facts and ANSI 3 22 2003 facts TMES Telephone magnetic field simulator A 38 4 mm diameter coil spaced 16 5 mm below a test surfaced driven by a specified test signal Intende
221. yle sheet select audioscan xsl from the choices presented keep the style sheet in the same folder as the data file 36 Verifit User s Guide Version 3 12 May 2015 To restore a session from a file 1 2 Press the Session key then highlight and lt PICK gt the top list button on the Session data poster Highlight and lt PICK gt Restore session from file Highlight and lt PICK gt the Client ID list button This will display a list of Client IDs with the first entry highlighted Use the mouse or the arrow keys on the keypad or connected keyboard to move the highlight in the list OR start typing the file name on a connected keyboard The highlight will move to the closest match as you type When the desired file name is highlighted press lt PICK gt or left click on the Client ID button you can always left click on any file in the list without highlighting it This will put the file name in the Client ID window and close the list Highlight and lt PICK gt the Session list button to generate a list of previously stored sessions for the indicated Client ID Highlight and lt PICK gt a session and press Continue Data storage using NOAH Audioscan offers a module for storing data in the NOAH framework on a Windows PC Contact Audioscan or visit www audioscan com for details 37 Verifit User s Guide Version 3 12 May 2015 8 Test Box Measures Setup The appearance of test box screens may be

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